I've been using AVAST for many years now, but these ads are forcing me to bail out and find a new anti-virus.
I'm a retired 30 year veteran of IT and I help a lot of friends with their computers. I've always recommended AVAST. I'm going to suggest that they switch now too, because I'm getting a lot of calls when they're confused by these ads.
One of the reasons I, and those I support, moved to the paid Pro version was to eliminate these popup ads. I could forgive AVAST for them when I was on the free version, but now that I'm paying, and I unchecked the box allowing popups, I expect to have an ad-free experience.