Why do you need a class action lawsuit? Simply sue the company in small claims court. Why give money to useless lawyer? You can put more money in your own pocket.
$5k isn’t going to get Google to stop lying. A class action settlement might.
OP was storing 400TB of data. I think Google charges like $100 / 2 TB so that's $20,000 /yr. Wondering if that would go outside small claims since small claims is up to €5000
This is something that should be under the purview of an agency like the FTC. If you are affected by this you could file a complaint with them.