I think this cuts two ways.

1. If anything goes wrong with this stream at all, whether it's Amazon's fault or not, it will be perceived as if they sabotaged it by the people who support him.
2. If nothing goes wrong then we have the same problem we had with ByteDance and Tik Tok, where the perception is that the platform is a "bastion of free speech that people who support him put more trust in. We saw how this went with Tik Tok. Where people were convinced that it was censoring them less and promoting more liberal content when in fact we know from recent news articles that this is not in fact the case.

Neither of these things should make twitch a good platform for this type of thing, but it does happen to be what is available and well known.