A few tens of thousand of people. We can see that through the statistics of active monthly users since then. I think many just left Reddit though, but unfortunately not enough. But still, if I look at the content and comments through RedReader it feels all kinda different there. Even more reposts than before, much more bot comments than before, much less comments overall and /r/all just looks different because many previously big subs are not really there anymore, while a lot of more niche subs suddenly appear frequently. It sometimes also feels more toxic with al lthe disinfo and insults but that might just be because a lot of the moderate people left. So the lack of sane comments puts an extra highlight on the shit stains of Reddit.
Left reddit recently bc of the toxicity, massive noticeable uptick across most subs. Blatant racism, homophobia and hate in general with next to zero moderation. The ads were just cancer(without a blocker) with the sponsored “he gets us” ones being unblockable and funded by a christian hate group prominently showing up constantly. Kbin has been an alright replacement minus the server issues recently