There is rightly a very high bar for a private entity to be regulated as a public utility, and definitely Twitter does not meet it. Twitter has nowhere near a monopoly on "the communication from the people they trust and want to listen to", or any structural advantages that would lead to one. The internet has an extremely broad and diverse range of venues where folks can make their voices heard. If that weren't true, I might have some sympathy for your argument, but as it is, I think it is very misguided.