Why not?

because half of the internet is there

That's why I explicitly wrote: "for stuff that should only be done by legitimate users".

That means Netflix et al can (and do) ban everything that even remotely smells like a datacenter IP range and not a residential one, because that is a common method of evading regional bans or undermine pricing structure.

And on top of that... if the focus of your website is humans, you might want to cut off all datacenter originating traffic as well. Save yourself the hassle of dealing with AI scrapers.