The systematic problem is the carriers who are processing such payments and don't ban abusive merchants, even when getting tons of complaints from users.

Here I don't think there is a legitimate mainstream use for DCB beside connecting to Google Play and Apple Store. The carriers can and should be able to tell me where my charges where coming from. Instead they call centre told me "its probably something you got from Google Play" even thought I've disabled the DCB payment method there. I found the vendor by inspecting my history as clicking an ad leaves a trace. Most consumers probably are not savvy enough to do that and give up at that point.

Edit: Even worse, this carrier offers a "safety online" package.. that is almost extortion since its safety they fail to ensure if you don't buy the package.