Also a federation can have multiple lightning gateways. Users select which gateway to use.
Discussion
That’s good to know, thanks! So each guardian could run a gateway then? If one went down then the federation would be running fractional reserve until that gateway came back online?
The gateways are separate from guardians. I believe the guardians must approve the gateways for their federation but anyone can run a gateway. The gateways are coded in such a way where the guardians and users never have custodial risk with the gateway.
I've learned a lot about fedimint from this guide: https://fedimint.org/docs/intro