Other case they suspected that your account has been hacked because you have login from different IP address
Which is absolutely moronic. Using Tor or a VPN is not a crime, and users should not be punished for it. And even without these, you will have a different IP on different devices, and a mobile phone's IP location can show up as hundreds of kilometers away from your actual location. Locking accounts because of different IP addresses is stupid at best.
You made a point, Locking accounts due to using VPN or some proxies is very unfortunate, some countries is very strict for banning some website, etc.
But Binance has the right to investigate also, what if the user login from VPN in 1 location lets say he use japan server and then the next hours or days he/she login using UK server and so on, the platform has all the right to investigate, since it might be a suspicious activity.