I'm gonna do some necromancy on this topic because I'm done with avast now.
Over the past few months I've noticed with increasing regularity that every time I hop onto a porn site, Avast chimes in with a helpful "Everyone can see what you're browsing use our security whatever" notification in the windows toolbar. At first I didn't think too much about it, but now I've realized that it consistently happens only when I browse porn- or nsfw sites, and only on them.
The only conclusion I can draw from this is that Avast is literally spying on my internet browser. Why else would it only show me that pop-up at those times?
This is the last straw, and I'm now officially done with avast. The quality of this product has consistently dropped over the years, and I can't in good conscience recommend this product to anyone anymore.
It's a real shame, because it's been my go-to anti-virus software for a great many years.
I heartily recommend every avast user to stop using this software completely, as to help stem these horrible business practices.