Thanks for the feedback, I appreciate that you are looking out for me really.

My intention, the meaning of "forever free", is that I will provide the service for anyone and everyone that cannot self-host themselves, but of course, if I don't have money myself to rent a server, for example, and I have to shut the app down I would inform the people using it. This is more or less expected from a free app in my experience and there is a paragraph in the terms related to this, under "NO GUARANTEES"

What I want to say though is that I won't charge users for as long as the app lives, if the app dies for whatever reason I will try to inform users to export their data and find a better place I guess.