If we didn't build and charge for our app then we can't continue working on it and improving. We enable many people to get support they wouldn't be able to otherwise and significantly broaden accessibility compared to medication and in-person therapy. We're not a non-profit but we do need to improve our model.
Linux is free and somehow that has gotten decades of support.
Most of the top contributors to Linux and other big FOSS projects do that work as a part of their salaried jobs at various corporations.
It's shocking that the myth of Linux being created and maintained by a bunch of dedicated outlaw nerds, typing away in their basements for free in their spare time (while presumably also working 50 hour weeks at their tech jobs, to pay the bills?) persists to any degree whatsoever in 2021.
Countless huge companies rely upon Linux in major ways, and therefore fund its development and maintenance.