The node in the phone uses LND+Neutrino
When you use nostr:nprofile1qqsrf5h4ya83jk8u6t9jgc76h6kalz3plp9vusjpm2ygqgalqhxgp9gpz4mhxue69uhk2er9dchxummnw3ezumrpdejqzyrhwden5te0dehhxarj9ekxzmnyqyt8wumn8ghj7un9d3shjtnwdaehgu3wvfskueq555fk2 wallet, you just open a channel. You don't run a bitcoin node
Maybe the LSPs connect to the Bitcoin Node 🤔
Discussion
No. Alby Hub depends on how you configure it:
Default: LDK with Electrum for fetching blocks
LND: Neutrino, Core, or BTCD
Phoenixd: Mempool.space instance