Twitter has not violated the rules of the internet
It's not his beliefs that got him banned from twitter. It was his posts. Twitter thinks those violated their TOS. The rules give them wide discretion to make that determination.
Oh yes it has.
I work on network protocols, so I know exactly what all the FCC regulations are, and Twitter most definitely is in total violation.
The internet is federally regulated, has to be federally regulated, and federal regulations do not allow for subjective censorship.
The only legal censorship would be if someone could sue Twitter if they did not censor, and that is not the case with Trump.
The Twitter Terms of Service are completely irrelevant.
They can not be arbitrary.
Like a restaurant can enforce "No shoes, no shirt, no service" because it could effect their business to other people, and is not a burden to any particular customer.
But Twitter has no such defense.
TOS are NOT rules.
They have no legal basis.
A TOS is just a helpful discussion.
It can not even be called a contract because there are no signatures.
Implied contracts, like "shrink wrap contracts", have been ruled illegal, many times.