Death by algorithm
It's inconsistently applied, there's no appeal, but it's cheap and you don't have to hire human moderators... And Google does love things that have global scale, so even if it's wrong, is it wrong enough for Google to care? No not at all
The fact that there's no feedback to the video owner is an indictment of the whole process.
I genuinely believe Shadow banning should be antithetical to social media. Maybe even against the law. The most cogent argument I've heard in defense of shadow banning is, if people know their shadow banned, they'll try to avoid the ban... This argument is the same as gaslighting, we think it's better to gaslight people than to argue with them about the truth.