@p @icedquinn @xue Yeah, Google could even lock their employees out of their buildings without it being much of a problem in the long term.

As for how effective ad-blockers are, I'm not sure. Quite a lot of people have been using ad-blockers and I haven't really seen much change except anti-adblock messages being a thing (where I then just close the page).
Ads on internet have been there for decades and it seems to be a growing industry.