I don’t know where you’re from and therefore don’t know what laws affect you but unless the ISP is involved in the media game (i.e HBO & AT&T) they don’t care about restricting access. In fact, they’re against it in most scenarios because if a competitor that doesn’t restrict access to piracy related websites exists, that competitor is likely to siphon customers from ISPs who impose restrictions.
On top of that, most ISPs do the absolute bare minimum to restrict your access so that you can bypass it easily, the most common being the modification of DNS records which you can easily bypass by changing your resolver.
TL:DR blame your lawmakers not your isp