Magma is not a streaming service — it's meant to be used for interactive, collaborative drawing performed by multiple people at once. You can have a maximum of 30 (50 if you are on a paid plan) people on one canvas at any given time.

However, nothing prevents you from streaming your Magma sessions with services like Twitch, YouTube, Instagram, etc. Just create your session first, invite people who you'd like to draw with and then start streaming to your audience!