We wrote the plugin for our own use, to replace Boltz, as
they changed their license from AGPL to a non-free license around 2023-04.
Since around 2023-08 we are no longer using Boltz. That is, the official swap server is now an electrum daemon with this plugin enabled.
Okay, so this is the reason why there's always a "
The swap server errored or is unreachable" error whenever I try using submarine swap.
It would've been great if this info is mentioned in the release notes, though.