I say "inconvenient views" because Google shut down Tulsi Gabbard's adwords account in the 24 to 48 hours following the first democratic debate about a year ago [0].
I think conservatives are the most vocal about this[1], but it is hard to track to total impact of something coming from an institutional level (with methods like shadow banning).
To the OP: I'd say be specific in your claims. Sweeping claims of shadowbanning aren't useful to anyone (perhaps a look here [2] will help you with composing useful copy).
If I were you, I would also reach out to the creators directly and offer your platform as an alternative.
[0] https://www.politico.com/story/2019/07/25/tulsi-gabbard-sues...
[1] https://duckduckgo.com/?q=youtube+shadowban+conservative+cha...