Imagine some replacement for tcp is proposed and a working group is set up to develop it. A member of that group might advocate for or against features. You could take the position "we should not include Feature X because it will have a performance impact in Scenario Y".

Scenario Y may or may not be real, but it doesn't matter, because you're using it as a stalking horse to get the outcome you actuality want, which happens to be defeated by Feature X.

The other group members know what you're up to, but they can't prove it because you have plausible deniability. They can't kick you out of the group because you serve 20% of the web.

To reiterate, I have no allegations to level against Cloudflare. I think it's a useful heuristic to assume that a public company, given sufficient market power, will become evil. CF has the market power.