Why “Just Store the App Data on Dropbox” won’t work for RSS readers

It almost sounds like RSS feed sync needs to be a "common good."

It's rivalrous - as more people sync feeds, the cost of providing the service increases (servers, bandwidth, etc)

And (to a lesser extent) it's non-excludable - Feed sync is only useful if many/all apps can use it. And to get many/all apps to use it, it needs to be free.