The app is intentional, with browsers they can’t control which extensions you run, and therefore can’t force their ads on you. With the app they can control the environment and you are legally not allowed to modify their app because trademark…

I once had a valid office key… But since I reset my computer to often the amount of “free activations” was used up… There where so many hoops to jump through to re-activate it that it was easier to get a cracked key to activate my office version… That’s just sick