This hasn’t been true for a while. Unless you are constantly looking for only the most mainstream stuff, huge swathes of material is lost with every shutdown.

The idea of piracy being invincible is a myth from a different internet era along with old patterns like “platforms spring up and die constantly”.

Yeah, in the 2000s that was true - but the main platforms we have today have been around for 20 years and have a stranglehold on users. The internet logic of the aughts no longer holds.