When your product has a monopoly market share, you don't get to use it as a weapon against competitors in other markets, even if you claim there is some imaginary exception to antitrust law involving servers.

It’s called “No duty to deal”

https://www.ftc.gov/advice-guidance/competition-guidance/gui...

You don't get to demand that the server support your endpoint, period. There is no precedent for that ever happening in US antitrust law, because it's not anticompetitive.

If you think otherwise, make your case to Google's lawyers instead of spinning hypothetical case law.