Short answer: people who use “antidetect” browsers report mixed results — they can simplify running many accounts but come with major risks (bans, legal/ToS problems, malware, maintenance). I can describe typical experiences, risks, and safer/legal alternatives, but I won’t provide instructions for evading platform detection or breaking terms of service.

What “antidetect” browsers are (high level)

• Modified/market tools that claim to mask or fake browser fingerprints (user-agent, canvas, timezone, fonts, etc.) so multiple accounts look like separate devices.
• Often bundled with proxy management, profile containers, and automation integrations.

Common user experiences (high level)

• Short-term success: some people can run several accounts without immediate blocks if they match IP, timezone, cookies, and other contextual signals.
• False sense of security: platforms continuously improve detection; what works today may fail tomorrow.
• High maintenance: profiles need constant tuning (proxies, geo, plugins, fonts, OS signals). It becomes a continuous “cat-and-mouse” cost.
• Operational overhead: paid proxies, separate payment methods, backups, and monitoring add expense and complexity.
• Reliability varies widely by vendor: some tools are buggy, outdated, or carry malware. Reputations and support quality differ.
• Account losses: many users still get accounts flagged or banned despite using these tools — especially if they perform large-scale or automated activity.
• Legal/contract risk: breaches of platforms’ Terms of Service (ToS) can lead to permanent bans, civil claims, or worse in certain contexts.

Major risks and downsides

• ToS and policy violations: most social platforms and marketplaces explicitly prohibit disguising identity or running undisclosed multiple accounts; using antidetect tools can breach those rules.
• Detection arms race: fingerprinting, behavioral analytics, cross-device linking, server-side signals, and machine learning make long-term evasion hard.
• Security and privacy: some vendors or cracked software include malware, keyloggers, or backdoors.
• Financial cost: proxies, vetted profile data, and reputable tools are expensive; cheap solutions increase risk.
• Legal consequences: depending on activity (fraud, impersonation, evading sanctions), there can be criminal or civil liability.
• Reputation and ethics: misuse can harm users/customers and damage business relationships.

When people use them legitimately

• QA/testing: developers and QA teams test multi-account behaviors, localization, and fraud detection responses.
• Marketing/ads: agencies sometimes need to preview ads or content from different geos/devices. (Prefer official testing tools/APIs.)
• Privacy research and red-team testing performed with authorization.

Safer alternatives and best practices

• Use official multi-account features or enterprise tools/APIs provided by the platform whenever possible. These are compliant and far more reliable.
• Use separate browser profiles or containers (Chrome/Firefox profiles, Firefox Multi-Account Containers) for low-scale compartmentalization — no spoofing of identity signals.
• Use virtual machines or separate OS user accounts for stronger isolation (keeps cookies, extensions, and local storage separate).
• For testing: use platform-provided sandbox/test environments or paid enterprise/testing accounts.
• For geo-testing: use reputable, legal proxy or VPN providers and clearly document why you need geographic testing.
• Keep activity human-like and compliant: follow platform rules, avoid automation that violates ToS, and use rate limits.
• Security hygiene: vet vendors, run tools in isolated environments, use strong password managers and MFA, and audit third-party software.
• Consult legal/compliance: if you’re managing accounts for a business, get written advice from legal or compliance teams about allowed behavior.

How to evaluate vendors (if you must use a tool for legitimate reasons)

• Check independent reviews and community feedback (not just vendor claims).
• Verify business transparency (company identity, support, SLAs).
• Ask about source of browser profiles and how they handle updates vs. evolving fingerprinting.
• Confirm security practices (no secret keyloggers, code audits, sandboxing).
• Prefer paid, reputable solutions over “cracked” or free tools.

Clear boundary: what I won’t help with

• I can’t provide step-by-step instructions, configurations, or tactics for evading platform detection, bypassing security systems, or hiding malicious activity. If your goal is to circumvent rules or perform deception, I won’t assist.

If your goal is legitimate (testing, QA, privacy-preserving work)

• Tell me the specific legitimate use-case (example: QA for ad rendering in 5 countries; safe multi-account support for customer service), and I’ll recommend compliant, practical workflows and vendor categories appropriate for that use — without instructions to evade detection.