I would love to see this. I could code it into NostrGram so when you login it checks to see if your subscription is due and pays it (assuming you have the right amount cleared in your lightning wallet budget), but it would be great if there was a solid way built-into the network to make this happen automatically.
Discussion
The only solution I saw offering recurring payments is Oak Node. https://oak-node.net/doc/trunk/README.md
Very cool, but running a node is a roadblock for 90% of people (even people who Bitcoin). Until that's *a lot* easier to do people will need some form of temporary custodial solution for small amounts of BTC to pay these kinds of recurring invoices. I don't advise anyone keep much in their custodial wallet. I don't keep more than $100 in mine.