Saying that using an adblocker is immoral is no different than saying that it is immoral to switch the TV channel in a commercial break
just that the TV commercial looks back at you through the TV and the TV follows you around everywhere, wherever you go, whatever you do, taking note of everything to get to know every single detail about you, every interest, every prejudice, every weakness of yours, to get to know you like no person, no matter how close to you...