I used to have no adblockers on anything, and I was fine with it. Then I had kids, and I wasn't really comfortable with bringing them up in an environment where when you tell a computer to do one thing ("Play this video") it does a different thing ("I will do that, but not before I do what I want to do"). There are a few websites that have ad supported videos that I am ok with my kids watching, and putting uBlock Origin on the computers means that when I tell my computer to play videos from those sites, I know that it is going to do just that, and I won't have my kids being manipulated by stuff they don't understand.

Ads in software are just a case of a computer not doing what you have asked it to do. It has always been ok to ignore ads - putting them on computers does not make them special in any way.

This is just my parenting, and I can imagine that other people want their children to value other things - and I might change things as they get older so they can understand how the ads work. Right now, they are not ready for that.