No, they don't all do that. Those kind of blocks are mostly confined to a handful of the larger ISPs, and especially the mobile providers. I've yet to manage to find something my current ISP blocks, for example. Might well be they block something, but none of the "usual suspects" that I'm willing to test (e.g. Pirate Bay, Sci Hub)
Not all of them. I’m on Zen, no filters as far as I’m aware, sci-hub works fine. Libgen is fine. Torrent sites that the ‘main’ ISPs block come up just fine, too.
Edit: some of the ISPs that do seem to land on this URL (note http) –