This is a brilliant point. I would pay for the automatic unsync but since these are MY files and they’re coming from MY cloud storage, the ability to manually unsync should be something I can do.
At the very least, a one-time fee of a few dollars ($5?) as others have suggested, to “unlock” the ability to manually do anything that the premium does automatically is a pretty darn good compromise. If 1/3 of the people using ODrive paid a one-time $5, your shareholders would be very, very happy.
As someone else said, SAAS pricing is hard. But find ways to make me /want/ to support you, not put up a wall stiff enough that I invest time in finding an alternative solution. ODrive is what I want to use. Don’t make it hard for me to support you.