90% of users on nostr use custodial lightning because it's the simplest way to use bitcoin for micro transactions.
Discussion
Where do you have this number from? Are there any stats around lightning addresses used on nostr?
custodial lightning makes no sense once you have cashu
nostr:nevent1qqs95jj8dy4m480x949zg8t5mq3lca0skgxe4xp9ufmwkw79wqsvwjcn2wfcf
Also as a "decoy mode" ...
Matches with receivers privacy is worse than senders.
Cost/benefit of using REPUTABLE custodial for, like < 300000 sats is a no brainer.
Because owning a domain name + vps just to receive a few sats is dumb and takes effort to make anonymous.
Doesn't make a great case for decentralization, does it?