I suspect that, too. I got two weeks of anti-ad blockers that required refreshing uBlock Origin. Then all anti-adblock messages stopped. Maybe Portugal has low priority. As far as I can see, practically no one will pay for Youtube Premium here.
Most adblocker users are unaffected because it's only had a limited rollout. I've both been affected and unaffected using same software in an inconsistent way.
Google has announced it will shut down Manifest V2 in June 2024 and move on to Manifest V3, the latest version of its Chrome extension specification that has faced criticism for putting limits on ad blockers.
Manifest V2 is the old model. The Chrome Web Store no longer accepts Manifest V2 extensions, but browsers can still use them. For now. Manifest V3 is supported generally in Chrome 88 or later and will be the standard after the transition planned to take place in June 2024.