That scenario will be true regardless, though, because Netflix can and does set up interconnects at dozens of peering locations to skip half the pipes.

It's true that it'd be bad for Discovery+ to pay for prioritizing their traffic over yours, and I'm very sympathetic to net neutrality on those grounds, but opponents would point out (as far as I can tell correctly) that ISPs have never really tried to build such a program. Throttling and traffic fees rarely come up except at the scale where the actual components of the underlying infrastructure matter.