Just because you only pay attention to mainstream (D) media doesn't mean he's not on others.
edit: should have done my own research better, the profile reads:
>Reserved for the 45th President of the United States of America🇺🇸 This account is an uncensored Twitter archive and shares email statements sent by The Office of Donald J. Trump.
AFAIK Trump isn't on gab.
Just because you only pay attention to mainstream (D) media doesn't mean he's not on others.