If self hosting is not an option. Ideas that come to mind:
Evaluate what it is worth to you and maybe pay for it, if they offer enough worth to you and it is affordable.
Then there are people who host it and provide it to others. Together with other apps, as a suite. Maybe that's an option. But I suppose, donating or paying is expected here, too.
Or switch to another solution. Preferably one with an import feature.