No reason also stated for removing the lightning wallet from the Google Playstore and App store for United States citizens not to be able to access it.
ACINQ, owners of Phoenix have explained that themselves:
Recent announcements from US authorities cast a doubt on whether self-custodial wallet providers, Lightning service providers, or even Lightning nodes could be considered Money Services Businesses and be regulated as such.
ACINQ has no MSB license, if the government identifies them as MSB they don't want to risk operating without one, so they are pulling out before they acquire one!
its not so much about the custody. regulators do treat 'services that facilitate the movement of funds on behalf of others for a fee' as a MSB. in short
LN routing requires a MSB licence to perform
LN routingthe method LN makes payments over a network via using partners liquidity in a pass-the-parcel IOU game in LN, is different to how bitcoin relays unconfirmed transactions on the bitcoin network.. this difference is and will cause headaches for LN users wanting to move funds(route) for a fee
its not just certain wallets but the whole method the LN system operates
the only way LN can succeed even as a niche sub service, is if people self custody lock their bitcoin value on the bitcoin network. and then set up a channel referencing such lock, where the channel is direct to intended destination for their payments.. to not need to utilise the 'gossip' routing table data(avoid middlemen(avoid routing) unless they want to pay higher admin fee)
in short: routing will add costs to LN fee making it expensive to route due to fee's needed to cover MSB regulated admin costs of a service offering routing.
this means people using LN will end up having to pre-plan months of potential spends to set up many channels direct with their favoured services using multiple channels...
in short they might aswell just set up multisigs with intended recipients on the bitcoin network and use a new private communication method to RBF unconfirmed transactions (emphasis privately) between each other(update states).. and just broadcast final settlements when one side of the multisigs funds are depleted thus need to settle to finalise the funds owed