Rossmann is advertising his own repair shop with those videos. And of course he sees only the bad stuff, since he repairs the broken ones.

MKBHD explains the issue pretty well here: https://www.youtube.com/watch?v=ndphYju6PVM

tl;dr Apple produces craptons of stuff, if just 0.01% of it fails, it's thousands of devices - and those users jump to social media to bitch about it, making it seem like a huge number of devices is affected.