I am not calling for it nor wishing for it, but they will argue the 'data usage bypass' that leads to a loss for them (instead 'clicking'/'viewing' jobs on sh*t linkedin website, users are using JobsByReferral).
But I guess they won't come to you right away, if you get some traction than you bet they will (even if from legal point of view it's not a clear path for a win)
Anyone can threaten legal action for anything, so you're not wrong, but JSearch also returns LinkedIn jobs so the traffic is headed right back to them anyway.