Journalists and bluechecks seem to be particularly mad about this. I guess they don't like the prospect of having to follow rules that are transparently enforced rather than the current system of favoritism and opacity
The more interesting aspect I find here is that in an open-source algorithm it is difficult to hide shady patterns that keep the user doom-scrolling.
So open-sourcing the algorithm would signal to me that a membership program is supposed to be a major contributor to Twitters revenue and ad revenue, which it currently most relies on, is going to be less important.
In my eyes that is a net positive.