@John Price
In total, about 3100 streamers on Twitch have earned up of 70k (before taxes) since august 2019.
Twitch Earnings Leaderboard
I chose this 70k because that means about 35k a year, and with a 20-30% of that outside of Twitch (subs, donations, youtube, insta, etc. - not counting OF here because that becomes an entire other beast) for the average streamer, that's what gives a decent, livable wage for doing that as a full time job.
Obviously, some of them may live in countries where 35k US a year makes you super rich, but that's a very small minority. Outliers exist (some of those 3100 streamers might be already popular people who make money doing other stuff but not frequent streamers, like artists and stuff)
So the 1% I mentioned earlier for "livable wage" really makes sense. If you need to reach the top 1% to make it your full time job, it really isn't a career worth pursuing for more than 2-3 years (and that's doing it part time or as a 2nd job). After those 2-3 years, you already know whether the algo has decided to grant you with the luck needed to be popular - hell, even after just 1 year you kinda know.
Also, thinking about it, I'm not even sure if those amounts are before or after the ~50% cut Twitch takes from subs and bits. I assume it's after, though.