Anyone can file a lawsuit for any reason. There are many class action lawsuits that are meritless and are often filed by greedy lawyers whose intent is to shake down a company for a settlement that involves nearly nothing for the plaintiffs and a large fee for themselves.
Quite weird, ain't it? Honestly account locks suck but it's better for Coinbase to be overly strict with their security rather than the opposite. People just look at it too much as a hindrance rather than a security measure.
Part of the issue IMO is the lack of good customer service and lack of physical locations to deal with some issues.
Had an issue with a bank starting in late July, spent hours on the phone and progress was VERY slow. But, after a few evenings of making slow progress I drove my ass down to the local branch and after about 90 minutes of the person I was dealing with and their manager working their way up the internal CoC the issue was fixed. Partly my fault, partly the banks fault and since the bank had bought the bank I was dealing with before partly the old banks fault. BUT, the issue was fixed since there were people who could handle it.
You can't do that with Coinbase so you are stuck dealing with offshore support. To make matters worse, there are a lot of people who are just starting in crypto and wind up at Coinbase and just don't understand how it's done. So it's not just a new thing (crypto) it's an entirely new way of dealing with money and they have issues.
-Dave