Using so-called "QQ membership brushing platforms" (whether claiming to be the cheapest or free) carries significant risks and violates Tencent's service terms. Here's why you should avoid them:

1. Scam and financial loss: Most such platforms are fraudulent—they may ask for upfront fees, trick you into sharing payment information, or disappear after you pay without delivering any service.
2. Account security threats: To use these services, you often need to provide your QQ password, verification code, or bind third-party accounts. This can lead to account theft, unauthorized access, or even permanent banning by Tencent for violating its rules.
3. Legal and compliance risks: Some platforms use illegal means (e.g., phishing, stolen payment data) to "brush" memberships. Involvement in such activities may expose you to legal liabilities.
   The only safe and legitimate way to get QQ membership is through official channels (e.g., QQ's own membership page, WeChat Pay, Tencent Video app). Please protect your account and property by staying away from unauthorized platforms.