You can, albeit with some effort involved, e.g. Ben Thomson has mentioned Stratechery does some kind of link counting like that with the podcast feed. It's a g

You can, albeit with some effort involved, e.g. Ben Thomson has mentioned Stratechery does some kind of link counting like that with the podcast feed. It's a good point that some amount of unauthorised sharing can be a positive. The main issue is it's hard to control without also having false positives, where the paying subscriber is annoyed by their service being revoked, having to re-auth, etc.