I would suspect the point is rather that you have a bunch of megabyte range files, and you rarely update them and don't have to sync. But for most workflows this feature seems targeted at, the free tier seems insufficient.
I don't think these facts are a problem. They create an open source tool, provide a location to try it out, and a service to pay to use it if you like it and don't want to host yourself. Seems like a fair offer.