they also receive money depending on the number of their subscribers.
Youtubers receive money but not depending on their subscribers but with the amount of views they receive.
Those mystery box videos are popular today, I've watched recently a video of the channel 'crypto NWO'. He also purchased a mystery box from dark web and he didn't highlighted that he received more than 20 btc on that box.
Wow! That's a lot of money though. Many youtubers are now milking crypto projects. No wonder, there are many biased reviews even they are crap projects. I hope they should be at least fair enough in presenting a specific project because their followers are sometimes relying on their side.