It's time to rethink twitter and launch another service. Readers want to see the content they select, in the order they select, from people/posters they find interesting. Have conversations and maybe connect with people they follow. Posters want to control their feed and who sees it, control the conversation a bit more, perhaps pay for better tools to curate replies, get rid of spam/trolls etc, have their complaints…
> Advertising is at the root of the problems of Twitter This is true, but it's not only advertising. Replace ads with any revenue generator large enough to sustain the service and you'll find that (1) the audience disappears or (2) big compromises in user experience or privacy. Maybe some services just can't be delivered by profit-maximizing corporations at all. A big reason for the wildly improbable success of Wikip…
A modest fee to join/unban yourself (and not infrequent bannings) worked for Something Awful but social media is slowly killing it off.