RethinkDB source relicensed, donated to the Linux Foundation

Not really. It's a sign that the "application provider" part of Affero GPL was a key part of the strategy in monetizing their software. It increased the sharing obligations for any potential competitors. If you're in the web services business, it helps to impose upon other web service businesses. Once you're out of the web services business, all you're doing is excluding Google and other anti-Affero types from using your software.