EU's single biggest win is free and open Single Market and it will fight to keep it so. It doesn't matter where companies come from – if you look at e.g. GDPR enforcement tracker you'll see they're as eager to keep internal EU companies in line.
See, the problem is that if I name one as an example, you will just fall back to silly games like "but the EU defined the term 'gatekeeper' in such a way that your example does not count". It does not matter whether the market dynamics are the same as the defined gatekeepers, whether the market shares are similar, or anything like that. Your side will shut down any debate with logic such as that. So why bother engaging?
It's like arguing with a hardcore religious person about god. "Oh, but that's not what I meant by 'god'".
>It does not matter whether the market dynamics are the same as the defined gatekeepers
Perhaps then find an example where this is the case.