Unfortunately the European Commission is always playing catch up (when it even tries) and it takes 10 years in court to get a fine enforced (if it's not struck down).

If you believe the hype, the Digital Markets Act (DMA) will change things. (Or, I guess, Microsoft will need to spend a bit more to buy compliance from the regulators.) https://www.europarl.europa.eu/news/en/press-room/20220315IP...