ACINQ should release the backend but I don't think they will until the EU becomes as hostile
Discussion
if they didn't already make their backend open source then why should we care if they ragequit?
Because it would be extremely beneficial if they DID release the backend. Possibly world changing for adoption if you could implement Phoenix backend to many different UI frontends, decentralize the providers and fee structures.
of course
why was it not released before tho?
Money, for sure, but if they are willing to abandon that for the whole US market, then let it fly loose