[random28345]

> I would host the product on my own servers

Don't do that. If you're targeting your product for the tinfoil hat crowd, that's simply not going to work. Instead, you create a build script that will generate your application from source, and (for example) generate a docker image. This image could be run on your servers, on a third-party server (AWS, DO, etc.) or on the user's own hardware, depending on the level of inconvenience/security tradeoff they are willing to endure.

I know you're probably looking for the consistent revenue streams of a SaaS, but unless user data can be completely encrypted during storage (e.g. email, backup, etc.), the truly paranoid don't want to trust their information to a 3rd party.