https://bitcointalksearch.org/topic/m.53851799
Luckily, their channel has been restored few days ago and its in their control now. Let's hope they are more careful from now on,both them and all the other YouTube channel owners, as bunch of them failed for a same trick and got their channel hacked.
The way scammers usually do it is that they pretend to have some software that needs promotion, and ask those YouTube creators to try it out and then they will pay them for promotion. But that software has some kind of malware, and they don't check properly before installing. Cheap trick, but many fell for that.
It is true though that there will always be few who will fall for this kind of thing, send 1 BTC and get 10 back. People do stupid things when they get greedy, and if crypto market doesn't lack something, it's the greedy people.