I know you can’t get a custom URL (YouTube.com/yournamehere) until you hit 100 subscribers. But the monetization isn’t that. I monetized my channel when I had 1,500 subs. I now have just over 2,500 and I’m able to monetize and use end screen cards and all that.
Granted these changes are more recent and I was already monetized. But, what I’ve read on the subject says it’s based on channel lifetime views. I can’t remember whether it’s 1,000 or 10,000 views, but your channel has to get a combined lifetime total view count (of that number) to qualify.
Which, honestly, is a fairly reasonable thing. Given the climate of fake or rip off channels. Especially “react” channels.
It was too easy for people to start a react channel, and repost some one else’s content, and just show a small picture in picture of themselves watching (or sometimes not even that) and earn money off the original video that was some one else’s, effectively stealing their views and income.
Making this change, I kinda think is a good thing. It helps separate the fake channels from those that actually want it and work for it.
It just means if you want it you have to work a little harder to get it. Which, I think, makes earning it that much more meaningful.