When Moons are minted and collected by Redditors. Who pays the gas fee, and how?

Just something I've been wondering about. Does anyone know the answer?

I'd assume the gas fee for transferring all the newly minted Moons into 10,000 different wallets is huge.

Do they use an L2 to keep fees lower? Or did they build their own?

Does it come out of the tokens earned so users are paying the gas fee themselves, which means if Moons lost value and/or gas fees spiked at some point, the system would collapse?

Also, how does the distribution system know how many Moons to give? Is it an SSO with our reddit account and then pulling our scores when we login?

Is there anywhere to read up on the distribution system as i'm curious how it works.