I set up my own instance to mess around with (and what I’m posting from now). The other instances interact with mine just fine and by default. It is certainly possible they could explicitly blacklist your instance, but short of an admin of another instance personally taking umbrage with you I can’t see that happening.
For myself I have set my instance to be private (for me and some friends) and the other instances I “federate” with are done on a whitelist, although you can definitely open up to everything and instead deny specific instances with a blacklist.
I set up my own instance to mess around with (and what I’m posting from now). The other instances interact with mine just fine and by default. It is certainly possible they could explicitly blacklist your instance, but short of an admin of another instance personally taking umbrage with you I can’t see that happening.
For myself I have set my instance to be private (for me and some friends) and the other instances I “federate” with are done on a whitelist, although you can definitely open up to everything and instead deny specific instances with a blacklist.