Well, when talking about server costs, Threema somehow has been running on a 5€ lifetime license and business customer subscribtions for over a decade. While briar and simplex are peer to peer and have nearly no ops costs. Sure, it can be made to be very expensive, but I'm arguing that doing so is a business/design decision. Servers can help improve the UX, but are expensive. Threema for example, only stores media on their servers temporarely, so they have way lower storage cost with a small tradeoff in userfriendlyness (of having to migratethe old media files you want to keep when you get a new phone). And so on. If your nonprofit only has 65k, don't hire multiple devs and provide nice-to-have features that lead to high ops expenses in servers and storage. It's called minimal viable prpduct for a reason.