The easiest way is to let the RIAA, MPAA, and other such organizations tell you: https://lumendatabase.org/

Lumen collects and publishes takedown notices sent to third parties, including Google. It's searchable, handy, and informative.

TPB is one of the very few (only?) torrent indexers to remain up since before netflix and the streaming era. The brand is a result of tenacity and good timing. They rode the torrent wave while it was getting big (arguably setting it in motion), and have kept that brand by just sticking around.

> arguably setting it in motion

i think it was suprnova

rarbg is a great one I use. Easy to filter on HDR/4k stuff.

Fortunately, There are chatbots that will gladly tell you the best trackers to seed your Creative Commons content.