The good ones won't go to a platform that purges speech. It may be OK for content marketers, but i don't see journalists that don't like to mince their words (e.g. greenwald) choosing to host their content on twitter.
"Most" definitely messes with the business model. The requirement is for only enough to get everyone else to fall in line. It also helps to make selections idiosyncraticly
arbitrary to maintain strategic ambiguity instead of drawing a clear line.