A user of one LSP can pay a user of another LSP trustlessly. Two users of disparate Ark's have to go through trusted middlemen. Trust aside, the cost of Lightning swaps to these centralized providers will easily exceed that of just opening a channel.

WoS is using Spark for their "custodial" wallet From memory.. Can find very little about technical details.. I don't trust it tbh..

If WoS (or their custodian), rugging all their users, would be absolutely BRUTAL for Bitcoin adoption!

I like phoenix, would be Amazing to have separate app, or software that watched the channel on chain, and could post a justice transaction if Phoenix tried to rug me.