"Six4Three lodged its original case in 2015 shortly after Facebook removed developers’ access to friends’ data. The company said it had invested $250,000 in developing an app called Pikinis that filtered users’ friends photos to find any of them in swimwear. Its launch was met with controversy."
So basically this company tried to do something creepy and invasive with users' data, were stopped by Facebook, and now they're taking advantage of the fact that the press is pissed off at Facebook and will uncritically regurgitate any negative claim about them in headlines as leverage in their court case against them, likely in the expectation that it'll be cheaper for Facebook to settle than deal with the PR fallout.
So basically this company tried to do something creepy and invasive with users' data, were stopped by Facebook, and now they're taking advantage of the fact that the press is pissed off at Facebook and will uncritically regurgitate any negative claim about them in headlines as leverage in their court case against them, likely in the expectation that it'll be cheaper for Facebook to settle than deal with the PR fallout.