I mean, I sorta knew Sketchfab being bought out was inherently not good, but now you can't even upload a model over 100mb without paying them even though when you sell, they're also still taking money. Ridiculous. I'd find another place to post work if you use them. That's just blatantly greedy. Honestly glad I never posted the packs I've been working on there, though I was planning on putting up there rather than Gumroad, but meh.
They are also encouraging you to arbitrarily let people download models just to obtain credits to further use the service: https://help.sketchfab.com/hc/en-us/articles/360031770411-Upload-Limits
sigh