Fer chries sakes.

Bombing is what ISIS/Da'ish want. But cutting-off their revenue is not exactly "nothing" nor is it "misguided". You could, instead, try a world wide ban on the sale of antiquities that have no provenance, or ban fund raising in Muslim communities, or go after the scam merchants and do a lot of collateral damage, not the least to relations. But how ya gonna execute those?

Corner them metaphorically and they have to break cover metaphorically. They will make mistakes and be more visible - cyberphorically.

FOLLOW THE MONEY - but do it effectively.