Mostly seconded. Another upside is this really does put a much larger cost to bots and problem accounts. Even $1 a year is a big deal if you've got an army of 5000 bot accounts (something pretty trivial in this environment).
I'm all for things like Kagi doing this RIGHT and supposedly not selling all my data, but I've argued that companies like twitter charging for access is the path to a healthier environment.
Oh and to add, earlier this year I would've bet money that if Musk started charging, it'd be WAY more. $1 a year is a very smart starting point for a whole slew of reasons, and will let them tier out their services.