That is because all those sites abused mobile ads.
They brought this upon themself.
Stupid advertisements that redirected to google play without notice, popups telling you you have an virus, huge banners that break webpages and so much more crap.


EDIT: I have also noticed certain friends DO disable ads if they actually like the site.
Lots of friends of mine use a certain anime streaming site and most of them disable ads there because the site actually adds value to their browsing.