Being a bank isn't cheap and smaller, poorly managed nodes on raspberry pi's harm the network more than help. If you want to learn, play with testnet. If you want merchant adoption, forget about telling them to run lightning nodes.

The ability to eject out of a managed solution is important but the reality is nobody is going from 0 to 100 with their own lightning node payment infrastructure unless they are highly technical and doing it for fun or to build out a product themselves.

Best to set them up with a mobile wallet that is a self custodial node attached to an LSP for assistance.