The snarky part of me thinks, well, they finally realized there's absolutely nothing distinctive about this airline to distinguish themselves from the US3 (well, aside from the fact that they can't match their operational reliability)
I don't know, the ability to fly non-Boeing MAX planes and free, fast wifi is pretty cool. I flew JetBlue for the first time to and from London last month, and I liked it so much that for a trip I'm taking in March to Dublin, I opted for JetBlue instead of United.