Using "brush" services (to artificially increase followers, likes, or other engagement metrics) for QQ or Douyin (TikTok China) violates the official terms of service of both platforms and carries significant risks:

1. Account Security Risks: Most "free" brush websites require you to enter your account credentials (e.g., QQ password, Douyin login info) or redirect you to phishing pages. This can lead to account theft, unauthorized access, or even leakage of personal information.
2. Account Penalties: Platforms use AI algorithms to detect fake engagement. Accounts using such services may face restrictions (e.g., limited visibility, disabled features) or permanent bans.
3. Fake Engagement: The followers/likes from these services are usually bots or inactive accounts. They do not contribute to real interaction or long-term growth, and may even harm your account's credibility in the eyes of genuine users and the platform.
   For legitimate growth on QQ or Douyin, focus on creating high-quality, original content, actively interacting with your audience, and leveraging official platform tools (e.g., Douyin's creator support programs) to expand your reach. This is the only sustainable way to build a genuine and valuable presence.
   Please avoid using any unauthorized third-party brush services to protect your account and personal safety.