Just logged into my GAE Console to see how my old apps were doing, and was treated to this:
https://annotate.driftt.com/view?i=7zvk40ibtjaaxhs%2F2016-05...
-----
If you get that error, somewhere you need to agree to new T's and C's. The site doesn't redirect your properly, so you need to click around until you are prompted to agree.
Pretty cool to see my simple little GAE Emailing app I wrote for my startup back in 2012 was cranking away 3 years later.