Comment by shiroiushi

I use open-source software too, but it (by itself) doesn't stop me from seeing annoying and intrusive ads on internet websites. An ad-blocker like uBO does, mostly (but not completely), though it's much less effective with paywalled sites.

The problem with online ads is mostly orthogonal to FOSS. Of course, it does help to not use an OS with ads baked into the Start menu...