I have a tab open that just loads a different ad every time I refresh. Apparently they've also started showing you a popup telling you that Youtube does not allow adblocking, telling you to either allow ads or buy YT Premium. Haven't seen that one myself, just started getting pre-video ads.
Seeing an ad on my desktop computer felt like someone just invaded my personal space or dipped their nuts in my drink while making eye contact, like I'm used to the browsing experience on phones sucking ass but I haven't had to deal with ads on PC in over a decade, it literally feels alien :what-the-hell:
Upload 1 minute of static to youtube for every ad they serve you against your will.
Ublock origin hasn't served me any ads yet.
That's what I'm using as well. It seems both ads and the pop-up are popping up randomly for different users. Maybe something something A/B testing
Make their tests cost them.
Are you using chrome?