Yes they have. I think that it’s not a law from the european union but a directive that then each country has to apply locally, but just with a simple search I found things like these:
https://variety.com/2022/digital/global/netflix-30-europe-content-quota-avms-1235286587/
https://looperinsights.com/what-do-new-european-content-laws-mean-for-streaming-services/
https://www.businessinsider.com/netflix-amazon-prime-video-eu-law-local-content-2018-9

Sorry, when I said Europe I meant the european union.

That law is in effect in Europe since a long time ago (in fact is thanks to that law that netflix carries so much non north-american content) and netflix didn’t remove any tiers.