1. Not much time has passed; 2. The ball is still in play (results coming); 3. The stock price never really jumped much on the PR, so harder to find victims or have your algorithm to sue tripped; 4. Lots of these firms troll for clients whether there is a real case or not; 5. Trolling for clients is not the same as filing a case; and, 6. Filing a case is not the same as having a case.
Yes Blarcamine you are correct. You can bet they are looking for any slip up to start one but if BP is sniffing around and likes what it sees I doubt they would attempt the frivolous ones anyway.