"An interesting thing that I noticed was that people subscribe and then stop using the product, without unsubscribing (I did have the unsubscribe button on the profile, no questions asked). I ended up manually cancelling a bunch of subscriptions on Stripe without updating the app DB, so people could still use the service (which they didn’t anyways)."

Thanks for being honest, a lot of others would have let it run forever instead of shutting it down properly

Thanks! It made me wonder at the time: how many SaaS products out there include these ghost users in their metrics and revenue reports? How many users sign up for stuff they don’t use, but still continue paying for it?

Not sure about reports, but there are plenty of people who continue to pay for services they don't use, which less than honest businesses take full advantage of; it can be very lucrative.