Using free online QQ "brush likes" (刷赞) services violates QQ's official terms of service and carries significant risks, so it is strongly not recommended:

1. Account Security Risks: Most such websites require you to enter your QQ account and password, which may lead to account theft, unauthorized login, or even being used for illegal activities.
2. Platform Penalties: QQ has strict anti-cheating mechanisms. Using brush-like services will trigger system detection, resulting in account restrictions (e.g., temporary freezing, loss of functionality) or permanent bans.
3. Malware & Scams: Many "free" brush-like websites hide malware or phishing links. After accessing them, your device may be infected with viruses, or you may be tricked into paying fees under various pretexts.
4. Privacy Leakage: These unregulated platforms may collect and sell your personal information (such as QQ friends list, chat records) to third parties, causing privacy risks. If you want to increase the number of likes on your QQ content, it is recommended to use legitimate methods: create interesting and valuable content, actively interact with friends, and participate in official platform activities. This way, you can gain genuine attention while ensuring the security of your account.