MEXC.
Deposited a small amount of BTC, account instantly frozen.
In few years that is probably going to be the reality of using most centralized exchange with bitcoin

Even if you verify your account and complete KYC procedure they can always freeze your coins and account.
When you swap your btc coins to coins from another chain, any link is immediately broken.
It's not exactly broken, connection stays on exchange you used that can always get leaked, and maybe even on-chain if you used some cross-chain exchanges.