Lemmy is neither popular nor heavily advertised, so people join at a slow rate
On the other hand, the amount political discussions, Hexbear, and lack of content result in disinterested people leaving Lemmy and joining Reddit
So the user count is decreasing because Reddit refugees are leaving faster than new people are joining
Windows 11 takes your money, gives you ads, sells your information and ignores your bug reports and feature requests
KDE is free, ad-free and open to contribution
I think we have a clear winner here