Can you bring them to small claims court?
Of course, IANAL, TINLA.
I've also got another grandfathered in free gsuite account I've been using for personal things for about 7 years, changing from that would be a nightmare.
I suppose I'm part of the problem, being unwilling to do something about it because I have more to lose than gain.
Business / $12 month
"Unlimited cloud storage (or 1TB per user if fewer than 5 users)"
Effectively you get unlimited storage for $12 + taxes/month.
It's a pretty smoking deal if you don't mind the (seemingly minuscule) chance that one day they'll ask for more money or pull the plug. In my use case all the data is easily retrieved again so it would only be a minor inconvenience.