Jack Mallers built Zap out of LND and BTCD some years ago now.

I don't think it's narrow enough to say "decentralised only" because most of the zaps on Nostr go through WoS and Breez and Phoenix etc. Well, ok, some of those don't play nice with Snort or are entirely not linkable with others.

I think the distinction is that Stacker sats are Schroedingers Sats. We can't really be sure they exist until we send them out.

A bit like the sats supposedly held in custody by CEXs