Could you consider a membership light without own cloud?
The minimum option is 29€/month, which is too much for many of us, tinkering as a hobby.
I would subscribe to a membership light at 29€/year on your own cloud to support you.
You may in turn allow more devices and buckets as an incentive.
I think, you may get more revenues, if you propose this option additionally.
What do you think about that idea?