You could use ecash to do LSP fee credits. Before StashPay I thought about building a mint just for fee credits that LSPs could integrate. But I got stuck on the regulatory part. You’d have to prevent users from spending until they have enough sats to open a channel. And there is a loss of privacy, since you couldn’t keep track of amounts to stay within legal limits. Otherwise you’d just end up hosting a mint for folks and custody their funds without limits.