excuse my ignorance.. AFAI-remember years ago Trump was "fired" out of presidency before end of mandate, AND banned in biggest social networks. Now he is play

excuse my ignorance.. AFAI-remember years ago Trump was "fired" out of presidency before end of mandate, AND banned in biggest social networks. Now he is playing president before officially entering a mandate, AND around that those same social networks bosses are cringeing - just in case? That's two things, one that the exact boundaries of period of the mandate doesn't seem to matter, and second, the social-media BS-dancing thing.. so who's in charge ?