- All centralized exchanges
That's it. It doesn't matter why they are doing it, but they can all do it and do it regularly. Some might do it in response to actions of your government, some might do it in response to pressure or regulations from other governments, some might do it because you triggered some arbitrary and unknown algorithm that makes them deem you high risk, some might do it because they spied on all your transactions and didn't like what they saw, some might do it because they didn't like your KYC data, some might do it because they didn't like your IP address, some might do it because there was a problem with your fiat transfer from your bank, the list is literally endless.
If you don't want to be at risk of centralized exchanges seizing your coins then the only safe option is to not hand over your coins to centralized exchanges, and use peer-to-peer trading via a DEX instead.