I'm still reading /r/boxoffice (on desktop using old.reddit) so that I can follow the Summer of Flops, but that's about it. If a community exists and is reasonably active on both Reddit and Lemmy/kbin, I won't touch the Reddit version.
There already is one. It just doesn't get much traffic.
I'm not planning on following box office stuff once things get back to normal, anyway, but there's been some nice schadenfreude seeing the big studios lose money.