That is actually cool. Though being custodial does take away some of its shine though. Would it be possible for this system to work for a non-custodial LN wallet?
If I had to guess, probably not for feature phones.
Since every user has a Lightning address (their [phone number]@8333.mobi and optionally, [username]@8333.mobi, thus anyone can send from to a Machankura user, including from non-custodial LN wallets.
For receiving, for a non-custodial wallet, I suppose the service could add a way you could provide an LNURL-Pay so then any payments received at your [phone number]@8333.mobi just get forwarded (sent again) to your own node. There's custody by 8333.mobi, but for just a short moment till the payment is forwarded.
I don't think they've decided how best to accommodate this, but I did heat that topic discussed on the Twitter spaces for this.
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