You should come to the Bitcoin Embassy in Tel Aviv

There's a relatively small but dedicated Bitcoin community, practically no one accept Bitcoin unfortunately...

Very soon: https://github.com/breez/breez-sdk-liquid/pull/920

Yes

Ofc you can

Again with the FUDing. Self-custodial is a regulatory term. If you hold your keys to the asset, the wallet is self-custodial, no matter ls what the asset is BTC, USDT or L-BTC. Now, the question is how protected the asset itself. With BTC, if you have a way to unilaterally exit to mainnet (which Liquid doesn't, but Spark for example does), you have control over your funds.

Misty Breez is self-custodial. You're referring to L-BTC, which is held in a Liquid federation. There are 15 functionaries (all from different entities) in Liquid, so no need to FUD in order to get ppl using your service.