You even have precedent. Apple shook down AT&T and turned itself into America's dominant phone manufacturer. They used the threat of releasing the insanely popular iPhone with a competitor network to dictate terms, and then eventually released a phone compatible with Verizon's network anyway.
Or look at cable networks in the 90s or 2000s, going directly to consumers to force the hands of providers.
So, consumers see slightly higher internet bills. Who cares? Better than the ad hell and AI-biased neutering we currently face.
Did they just not think it could get this bad? Or was the goal just always to make us the product?
To the contrary, the big sites want the opposite: they want all users to have as good connections to them as possible, which they achieve by being nice to ISPs.
And generally, the whole idea of competition law is to try to prevent extremely large companies from leveraging their dominance like that, rather than competing on price/quality/etc in a way that would benefit consumers.