And now, without any warning, it is not. For many use cases, rclone is the only practical way of getting data in and out of Amazon Cloud Drive.
Amazon still hasn't bothered contacting me to let me know. Despite the fact that rclone was used with my Amazon Cloud Drive account daily.
"Oh hey FYI, we've disabled the app you use to access your data, good luck getting your data, have a nice day" would have actually been better than they approach they chose instead (disable my access + radio silence).
Fortunately I planned for this eventuality.
But this is yet another striking reminder of how foolish it would be to doing anything important while depending on just one cloud company.
After the thunderstorm, when the sun shines, often the clouds are no longer there.