Some posts recently made me realize not all who are new here know this.
It is important that you're on an instance where you feel you can trust your instance provider to make the right calls for you, especially around blocking other instances. If you don’t trust the admin of the instance you're on, then you should move somewhere else, be that to a smaller instance where you can more easily communicate with the admin or a larger instance where it's less personal and might feel better for whatever reason
As a reminder, you have to trust someone somewhere in the line for social media to work. So please don't come at me saying "trust is a valuable resource I'm keeping to myself". If you'd rather use Twitter, you're putting your trust in their admins all the same