@aral yes, that is one of the ways in which Twitter is not like most post offices.
It depends. What are the alternatives? Does one's continued use of a service really help the provider of that service?
I think way too many people are continuing to use Twitter/X right now, and if the people who don't have good reasons to keep using would stop, the most important reason for many of the people who do have a good reason for staying would cease to be.