Permanent URLs could be Posthaven’s achilles heel  

Permanent URLs are a powerful idea, and it’s a feature of using Posthaven we think you should get even if you stop paying. We’ll keep the site online, but you won’t be able to edit content or add to it.

This doesn’t make much sense to me. I recognise that editing data is of personal value to the user, yet surely it is public URL access to said data which is the real cost for Posthaven. Billions of queries and millions of files delivered everyday is not cheap.

This lead me to the obvious question, what happens when there are not enough concurrent customers (quite likely due to churn) to support the accumulated net cost of all forever hosting?

A suggestion, and this is where it gets interesting. Always allow users to write, edit and save old and new content, yet restrict the distribution of old or new posts if payment is suspended. This benefits both parties. Firstly, the customer will continue to feel as though they still ‘own’ their data (they will always own it, but limiting editing does feel quite invasive and potentially pushes them off service) and secondly, you’re ensuring costs are directly related to those paying for the distribution, which will undoubtedly represent the largest cost in running Posthaven.