How do Data Raven and Chum interact?
From the FAQ:

Does the Runner take damage if he jacks out after encountering a Chum
and not breaking its subroutine?
No. The Runner has not encountered
another piece of ice, and  so the subroutine on Chum has no effect.

Data Raven's &quot;tag or quit&quot; ability triggers when the runner encounters the ICE, though.  So by that point the runner MUST now break all the subroutines or pay the Chum penalty... jacking out of the run now won't save them.