I'm pretty sure the ToS allows Google to close an account for any reason they see fit. I would not place a lot of trust in a lawsuit in this case myself.

There's something very scary about account closures like these and the lack of appeal opportunity. In general Google's support is abysmal, but I can somewhat see how providing support for all free users would be extremely expensive.

However to wake up one day and find that everything you trusted Google to keep safe is now locked away from you without any avenue of reaching a human to appeal, or even just to get a copy of your data is quite scary.