I started boycotting Samsung forever when I woke up one morning to the NFL app on my home screen on a Galaxy S6. Able to be disabled, but the fact that they'll install spam apps long after you've bought a device is really malicious.
+ the shitshow called Galaxy Store that you mandatory have to visit if you care about security updates always greets me with a dialog that suggests to install some game _and_ I have to opt-out for _every_ game. I don't know any real world example were you can be forced to watch an ad before something broken gets fixed. That only works in the (virt.) environment of a quasi monopoly.