Its probably more likely that Youtube is just trying to pull a twitch and ban drama or any slightly edgy content so they can be like Twitch and have an UwU wholesome appearance. Soon all you'll be able to watch is Jimmy Fallon, breadtube, and the shitty kid channels that youtube shills on "trending".
It's well known Ethan is buddy with Susan and has motive to deal with the commentary community considering how he is now disliked. I doubt he struck the Imalllex video and can't confirm if struck down the H3 one. We know Ethan visited Susan while she was floating around the idea of stopping "creator harassment"; again there is no evidence that Ethan encouraged this policy change, but either way I don't care who did it or if Ethan was behind Leafy's video being struck all that matters is that Youtube like Google wants to sanitize and control the internet.