I’m guessing just like real-debrid etc… with very little knowledge of even what it is beyond what I can see on it’s page, my guess is it’s like one company that buys a bunch of premium subscriptions to say keep2share and all the other premium file services. Then basically works as a proxy. Downloading and re-giving them out. (which yeah no question it has to be paid to do so)

They ask for some invite codenhere https://debrid.squid.wtf/#/register

Interesting, but it also looks like it might be a paid service.