Err, no, they controlled only the people who chose to use their apps or play store.
That's still open, you can do whatever you want, it's just if you want their stuff, you play by their rules.
The Google apps and the app store are not open. Everything else is.
And now the EU Commission thinks that this is an unfair (due to market share) agreement, because it prevents competition. (Which is trivially does, since no OEM can start making and marketing and selling a competitor.)