Why are there people that don't know how to adblock?
Usually information this important will spread to the people that need it. That hasn't happened here. What's blocking it?
My mother doesn't know how to turn off the phone, toggle airplane mode/wifi or use the app switcher... She refuses to learn because its not worth her time. I have family, friends and such that similarly refuse to learn basic things, much less go seek out an ad blocker and learn how to use it for an interface (the web browser) they think they rarely use.
Also, on mobile, it is kinda tricky because you can install an adblock browser, but the app selection is kinda iffy, and it won't replace the unfiltered system webview.
On Android, WebView provider can be changed. On iPhone, SafariView supports ad blocking so it's a problem for apps that uses iOS WebView. Most apps should use SafariView for displaying external websites.