I hate some bands, but at least I understand why they are popular (e.g. Cyrus or Bieber). With U2 I don't even understand the latter. Is it the constant charity

I hate some bands, but at least I understand why they are popular (e.g. Cyrus or Bieber). With U2 I don't even understand the latter. Is it the constant charity-pushing or some amplifying recursive effect of their networking?