likely because of the federal actions against the Samourai Wallet team. Being arrested for running an unregistered money service business is having a chilling effect.
edit: From ACINQ who runs Phoenix Wallet
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.
Sad Day? or an opportunity to grow? Run your own Bitcoin and Lightning Nodes people.