There is a lot of hype around move to earn concept of tokens.
BUT I don't understand where does the money for the rewards come from? ''Who'' pays these rewards?
Can someone please explain that to me? THANKS!

AFAIK, these are crowd funded so there's really the funding to make it start. And to go with the business model, there goes the sales from their own token and if the price goes up then there's a sure profit for the developers of it.
The business model of these tokens run from that and that's why they've been continuous in development and growth because they have a foundation from their investors at their start.