For example, go to https://community.ee.co.uk/t5/My-EE-app-and-website/EE-Site-... and search for "Adblocker" in this page. You will find a story where their mobile service provider blacklisted their IP because they clicked on a button on the website while their adblocker was enabled.
Exactly the same thing happened to me with the same mobile service provider except that I was using uBlock origin when my mobile service provider blacklisted my IP.
Bank websites sometimes breaking in the presence of an adblocker is a common occurrence in many parts of the world.
You live in one geography and you visit websites that you need in your life. Do not assume everyone else is having the same experience as you. Websites breaking in the presence of adblockers is a real thing that sometimes makes us hesitate to install it on the browsers of our friends and family who may not be as tech savvy as we are.
I still install uBlock Origin on most of my friends computers, but make sure they know to open any sites that break in a private tab.
The default rules probably won't cause issues, but you'll still see a lot of ads. As you optimize these away, things start breaking