the browser did limit the capabilities of adblockers quite drastically lately, but this is surly a coincidence.
https://textslashplain.com/2024/10/13/content-blocking-in-ma... shows a ten-line ad blocker that blocks Google's ads, https://github.com/extesy/hoverzoom/discussions/670 is a list of polite email messages from people who'd like to have elevated access to browsers.
uBlock Origin Lite blocks YouTube ads just fine.
Do you really think Google wouldn't do anything about as blockers? Especially now that no ads is one of the selling points of YouTube Premium?
And it doesn't matter what I think about it. I'm giving you facts not opinions.