I'd be surprised if they were remotely worried about that, seems much more likely they either believe it to be the right thing to do on principle (as claimed) - of course, whether it's the free speech principle they claim, or a pro-Trump principle, is another question - or believe that the views/engagements they get from having him on Twitter outweigh the negatives.

No bait is needed, Trump just needs the right excuse to backpedal and not lose face.