This is a good question, with nuance. What is defined as usage? I mainly used Twitter from the web and official app, almost never posted (I think similar to the vast majority). But, I always got the feeling the heavy content creators were often using 3rd party clients for ease of multi-account, timed posts, tracking, etc... Twitter needs to be careful not to inadvertently kick off the relatively small number of creators, because then they'll lose the vast majority of users who are simply lurkers.
Case in point, all the people I followed moved to Mastodon. I setup an account there and see my same follows and only head over to Twitter when given a direct link to something. Twitter didn't do anything to directly push me off, but they pushed off the people I followed so I went to where they were.