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YouTube's ad problem just got worse: Users now seeing 90-second unskippable ads!
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
It wasn't my answer, but I'll play the part.
I agree with you in cases where individual change is hard, costly and has barely any influence on the big picture (like your "individual CO2 footprint"). But in this case the individual solution is to quit using a terrible browser and install a free extension in the new one, and it has all the impact it needs because it makes the problem go away. I can't take anybody seriously who will willingly put themselves through youtube ads when they are this easily avoided.
In your example you say reducing your individual CO2 print is hard. It's not. It just has no real effect against the larger problem. The same thing is true here.
And that's why the ads will always exist and people will always complain about them. It also funds them to eventually find ways around your individual solutions.
I guess answers like these misunderstand that you're fighting a losing battle.