I’m so confused on how rollout happens. Is it random? I’m in a first world country (not the USA), using Firefox and Ublock Origin and have never experienced the popups. I use YouTube daily, often watching 10+ videos a day, and have never seen an ad or the popup. I have also never done anything to update my extensions or purge the cache as you mentioned. I’ve just had 0 issues. On mobile, I use Newpipe (BraveNewPipe, a fork with sponsorblock) and once again, 0 issues.