Anna’s Archive has largely flown under the radar by focusing on books.

Even perceived involvement in music piracy puts a much bigger target on their back from far more aggressive actors (RIAA, major labels)

The bulk of today's customers has no idea how to pirate music, so they're not really a threat anymore. Music streaming has been rather convenient, you pretty much get the same content across all services. Video streaming platforms have, unfortunately become fragmented and, as of late, ad-ridden.

“Good luck, we don’t care.” is their stance, as far as I can tell.