Okay, let's go

1. They know what you're talking about with your friends.
2. They block your account until you provide your phone number if they see you're using VPN or Tor.
3. They are disabling users' accounts and not providing reason.
4. It's centralized.
5. It's a spyware. They log everything you click (you can send a data request and see).
6. They force you to use a closed-source client and you can't use an alternative client because they will probably disable your account.
7. They changed the nickname system and made it pay to win.

Need more?