500k subs or 200 views on a stream?
I'm interested to hear why live viewers are worth 2500x more than 1 subscriber?
Is that because of engagement? Bigger commitment to watch something live than it is to push a subscriber button?
I mostly agree, but I'd like to see where you're coming from.
My YT channel recently averaged 15 concurrent viewers on ~4hr long live-stream, with a peak of 25 viewers briefly mid-way through. I raised $300 for charity during those 4 hours. So, while that is anecdotal evidence at best and there are many factors that went into it, I can confidently tell you that even my most viral videos (for me, 40k-50k views on a video is what I consider viral at this stage of my channel's growth), don't earn more than $500 over their lifetime, when I take all the Patreon pledges and ad revenue into account.
So, in a way, a few dozen or maybe a hundred concurrent viewers on a live-stream is roughly equal to tens of thousands of views on a regular YT video.
It's difficult to compare it to sub counts, because subscribers are only an indirect measure of notoriety/success.
Now, on the main topic of being famous, I've seen several comments here saying 10k subs might be a minimum for being considered famous. I'm about to hit that in 2-3 months and I can tell you I am and still will be a total stranger to 99.9999% of people on this planet, maybe even 99.99999% considering a lot of my life-time channel views come from the same people or people who only watch me once and forget about my channel forever.
It's also relative, if I attend some kind of event or gathering related to the niche I cover, a lot of people might actually know about my channel. At the same time, attending some ordinary concert or festival, I'm still just another random face in the crowd.
To me, I'd say 100k subscribers is a rough minimum to consider a channel or a person behind it famous in a way, because those channels usually have millions, if not tens of millions of views and they've been seen by quite a lot of people. That said, there are hundreds, if not thousands of channels out there with 100k+ subscribers that I've never seen or heard about, so mainstream fame cut-off point, at least in 2020, is probably closer to 1 million subs.