Web-based, although there is a cool little hardware device you can get for about €20.

Custodial lightning, but we'll be pushing for self custody through automated sweeps on-chain or real-time forwards to a non-custodial lightning address.

We manage our own node and liquidity.

No fiat off-ramp. Hiping to encourage P-2-P trading with local plebs if merchants need fiat for some reason.

I'll put a blog post together to explain more, but that's basically it.