My DD did this pre-covid. She went with Bunac who are a similar thing to Camp America.
She definitely ended up with some money at the end. She had around a £1,000 at the end of of working at the camp I seem to remember, some of which she spent on travelling around the US before returning home.
I just did a quick check in case my memory was wrong and this is what they say currently (figures were a bit different back when my DD did it):
Minimum camp salary US$2,200 (food and accommodation are included).
Costs payable to Bunac £399
Cost of work visa & background check £160
Return flights I just checked online and prices start at about £450 but British Airways are about £600.
So, minimum salary of US$2,200 is £1,670
Cost of visas, flights etc £1,000 or £1,150 if flying BA so, net, it looks like currently they'll end up with around £520 - £670 after taking account of costs.
https://bunac.org/summer-camp/camp-usa