Because you believe in free speech you should have to put a sign on your lawn that says anything I want it to say, no matter how vile, stupid, or hateful.
What's funny is that conservatives don't seem to understand the extremely obvious reason why right wing 'free speech' twitter clones fail. They fail because the bans and tweet deletions are what normal consumers want so that the place doesn't get too toxic.
When you make a Twitter clone that's all about attracting those castoffs what you end up with is a service full of racist, antisocial shitposters, and the average person wants nothing to do with that so they avoid the service. Amusingly, generally speaking the Twitter castoffs don't like these sites either because the antisocial shitposting was what they liked and all their normie targets are gone.