So self-start in twitch, which is free, and then move onto another platform that allows for sponsorships once you get one and can therefore afford to pay for the bandwidth.
It's not easy to move your viewership out of Twitch. Even top Twitch streamers had this difficulty so it's not going to be doable for an up and coming streamer.
Which is an indicator of the utility of the streamer vs the utility of the platform.
In a world with better social policies, the real question would be whether profiting off of teenagers marketing to other teenagers should be unregulated and whether the absurd heavy-handed selective censorship and highly questionable moral compass of Twitch Inc should be continued allowed to shape children.