You should not do anything serious on Google-based technology, especially not on non-core technology, as it cannot be depended on to be properly supported or even exist at all.
Similarly, it's safe to assume that any and all data that can be collected will be sent to the mother-ship for whichever purpose they see fit. I increasingly believe that the very similar act of hosting your proprietary code on Github is plain dumb. We're lazy and naive, actively creating these monopolies by giving away our value, data and secrets for free.
Convenience and (initially) free is how we keep falling for this.
Google is both harmful and childish. They don't do responsibility. They toy around like little children and cannot even grasp the concept of a customer. They can suck and screw up anything they touch for decades in a row with seemingly zero consequences. Because somehow 30 billion gets printed every quarter regardless of what they do. That would be 30 billion earned over the backs of the content WE produce, not Google.
In fairness, their office is an excellent adult daycare center.