Yes, it's quite baffling to be repeatedly bombarded with the same ad and no way to make it stop. It feels just like spam did in the old days.

It's good that you managed to get the advertiser to stop in your case.

Google Ads also has a way to tell it to stop showing a certain ad, but it doesn't work here, either because it's broken or the advertiser found a way to get around it.

I thought other people might have ran into this exact problem with YouTube, but it seems, not that many.