It doesn’t have to do that, this is a way to get additional revenue. One of my points listed here is specifically that it is fully orthogonal to all existing revenue streams. My suggestion was not charge for edits and remove ads.
The entire post is written in a “had they done this” format, and contrasted to things like charging for Twitter Blue. Clearly this is meant as “why didn’t they do this instead,” not “this is what they should do now.”