Many do not use the Lightning Network due to its inherent privacy issues.
Discussion
Nutzaps fixe this. See NIP-61 and talk to nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft if you need more detail
"DISCLAIMER: Use with caution - the project is highly experimental."
It seems to work on Cashu.
eCash/Cashu likely has its place as a more private, non-techy custodial solution on top of BTC, though it does come with very real risks of custodial rugpulling and malicious actors.
Are there such thing as Bolt12 zaps yet?
Privacy issues? Lightning can be very private. You won't be able to identify anything about me from my lightning address. Anyone using private channels will be invisible on the lightning network.
Everyone should only ever use private, unannounced channels for lightning. Only for-profit public routing nodes should use public announced channels.
That's how you remain invisible on the lightning network.