Not exactly clear on your point. Is it to say that anyone who opposes limiting a platform's power to control speech on its services is implicitly supporting this bad policy? If so you might as well complain that the federal government still hasn't outlawed disliking gay people.

At any rate, this would be a stupid and abhorrent policy which would nonetheless not discriminate in the sense described by federal law. The marketplace of ideas being what it is, I'm not sure what kind of foothold such a site would be able to get, having such a stupid policy.