Some YT questions

I would like some advice/info/thoughts for some YT channel related questions.

There is a channel that was created in May 2023.
It means its 36 days old channel.
It has around 25-40 videos.

The content is original and very easy to make.
Somehow the channel "blew up" within this 36 days.

He has over 10k subs already.

Primary thing: he is monetized too.
His earnings are very good according to SocialBlade.


How is that possible to blow up channel so quickly?
How he got so many subs and also monetization so quickly?

Some guy told me that he probably bought an "end screen" from some bigger same niche channel.
Or how that is called?

But there are very few such channels on YT what the guy is making.

He's not even English guy. Tries to speak in ENG though.

Im just interested how to do it so quickly?
I can create same content, this is not a problem. Super easy and I have equipment.
Thanks

We need more for the analysys
Views of the most popular vids
Niche
Language
Buying the promotion could be an option, but it depends of the views

There is a possibility that the channel purchased subscribers to reach the monetization threshold quickly. check the engagement level to know if the subscribers are real.