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)

It's in alpha. Closed testing only. You can try for an invite on the Squid discord later on.

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

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