As far as I see it, it is something like this.
Yes, there is revenue loss for the SPs due to people using instant messaging services - which is actually nothing new. However, there must have been an increase in revenue for total bandwidth usage, it is fact that people have become more data hungry over the internet. Movies, series, music, PC games have gained a massive movement for distributing over the internet - seems as though console games are well on their way here too.
So please Vodscum and EmptN, do us all a big favour STFU now already while we continue to fill your greedy hands with our hard earned cash. We pay you for data, how we use it has f***all to do with you. If someone wants to use it to go and buy cocaine on the darkweb, then so be it. It is not their job to police or dictate how data is used.
Cull is right on point here, this is more a topic of net neutrality than anything else. Screw this one up and good bye open internet in the future as we know it.