The two things I've seen people froth at the mouth over for kick is:
a) It's financed by a crypto gambling company (Stake), and gambling is bad (but gatcha is okay somehow). They figure it'll be encouraged and act as a gateway drug site for encouraging young gamers to gamble.
b) Places like Kick and Rumble and all of those alternate sites are populated by the people who got banned on Twitch and Youtube, so some people assume that everyone posting there is doing videos of themselves dressed in KKK robes while clubbing baby seals to death with their second amendment rifle stocks and screaming out racial epitaphs about how much they love (the Christian) God. And hey, maybe someone is posting that there, but some people seem to think that everyone using it is like that and therefore if you use the site that you're like that. The typical broad brush that modern social media dwellers seem to love using.