How much do they get paid?
I don't know of anyone else but J.Cassanova said when he was on they were paying him 10gs a month. With how many people have an energy drink sponsor that you wouldn't have guessed in a million years (like Foy, Ishod, GT etc...) I have to assume they are getting paid a shitload. Maybe not all (or any) are quite making Jereme money but still probably a lot.
And the people that you see sporting the hats everywhere (like Midler, Joslin, Nyjah) you can probably guess that those people have it in their contract to get incentives whenever they do it. I'd wear a fucking logo on my hat too if I got paid for it too haha.
In all honesty, while I think energy drinks are absolute dog shit for your health, especially to drink while doing such a physical activity like skateboarding, I highly doubt anyone is actually drinking them and if any are it's certainly not while they are skating. If you see them with a can at an event or contest it's just canned water the brand makes made to look like the can of their normal drink. So basically, if people like Ishod are getting paid then fuck it.
Oh and I don't know about any other brand but I do know Red Bull has one of the best recovery/rehab facilities in the world and it's available to any athletes that get injured, skateboarders include.
https://www.si.com/edge/2015/05/08/sweat-mecca-red-bull-high-performance-center