It was affecting me a week or so back. Got the threats, then the threats with a 10 second countdown before you can hit the X button, then the 3 strikes, and after 2 strikes got the you are blocked forever message.
That was kind of intermittent, as Ublock and Brave were in a(nother) whack-a-mole fight with Youtube.
Then with Brave browser with shields up, but Ublock disabled, it all started working again.
When logged in, and making a vid open in an incognito window, vids always played OK with no ads and no warning popup.
NFW am I paying 50% more than a Netflix sub to get Youtube premium. I will consider donating that amount to a couple of content creators that I watch regularly though, via a service that takes a 10% cut rather than 40%.