I went to visit a friend a few days ago. At some point she wanted to show me something on YouTube on her laptop. While staring surprised at the screen, I asked, "What is this? Is it what you wanted to show me?" She was as surprised as me, "No, of course not, this is just an ad." It felt very strange to me as I haven't seen an ad on YouTube for many years.
So I inquired, "You know adblockers exist, why do you put up with this crap?" She answered, "Yes, sometimes people tell me this, then I install it, and then something breaks, like YouTube layout or the comments don't load etc., so I uninstall it, this happens every few years."
So this gave me some insight why a non-technical person may choose not to use an adblocker. I fixed it for her and I hope she enjoys smooth experience for a few months.