Why isn't only fans illegal?

It acts sort of like file sharing sites/music sharing sites, like limewire and morpheus. You can just steal the content, and share it, and many people with onlyfans have even got fired because of their content from their day jobs.

How is only fans, not illegal. Metallica SUED Napster, so why hasn't anybody sued ONLYFANS

Updates
+1 y
do not restate my question

answer it!
Why isn't only fans illegal?
Post Opinion