Indeed it's not secure, and there are many pitfalls, I am just looking at what are the lowest of tech methods to get bitcoin in the hands of people, be that custodial or non-custodially

I would add many African telecoms are also adding RCS - Rich communication Services which allow for the SMS bearer as the delivery but can offer encryption and file attachments.

I could also see USSD banking services leveraging bitcoin too, where users could broadcast to a lightning node to make transactions and check balances.

Having an operator like this could leverage what we have already in different African countries making cross-boarder payments easier and encouraging bitcoin adoption across the region not just where its legal tender.

Yes bitcoin will be lost, bitcoin will be stolen, but this is the cost of adoption