"You secretly installed crap I didn't want on my computer!"

"No, I didn't. I threw up a button that you'd never click on purpose hoping you'd accidentally click it and give me 'permission' to install crap you didn't want on your computer."

"Oh, good. For a minute there I thought you were some kind of scumbag."

(ethics of bundling undesired programs in installers notwithstanding, users are asserting that the thing didn't just change their defaults but also kept resetting their defaults even after the user changed it back. Not cool even if the user installed it entirely on purpose)