Elon or his successor will eventually put everything on Twitter behind a paywall. More and more people are abandoning the concept that if you want a financially viable service, it can no longer be funded by the advertising, voluntary donation or voluntary subscription model but only the mandatory subscription one. It is where the winds of change are blowing (I've noted content creators are now moving toward a paywalled website of content they control and charge for whether it's Nebula or Publica) but it does risk making what is currently free or low cost prohibitively expensive for consumers in the same way satellite and cable TV went.