A typical streamer which can life from it but isn't getting rich (or even wealthy!) tends to stream 6+h streams at at least 3 days a week more likely 4-5. Which additional time costs for stuff like filling taxes preparing streams, updating software etc. it's not too rare for streamers to have a 50+ hour week, without getting rich or even wealthy from it. While some pop of and get wealthy or rich it's not the norm. Most do so because they love what they are doing and/or would have problems with other jobs.

I have seen multiple cases of small streamers using Twitch as a form a therapy to help them to overcome social awkwardness or some kinds of anxiety. Also some cases of depressive or otherwise sick people using it to have something like a job even through they are to sick to get any normal job even if they didn't need it for money (to avoid brain rot of being stuck at home and maybe some additional semi-social contacts).

Naturally there are exceptions e.g. of streamers "capturing some whales" and making quite good money with a fraction of the effort of the normal case, but in the end this are exceptions.