Small tangent, but I feel like it is a good time to drop the term "net neutrality", which covers way too much ground. In the past in political discussions, the term "violation of net neutrality" was used to protest multiple different issues: * Traffic shaping (e.g. slowing down Bittorrent traffic) * Traffic fast lanes (pay for priority access to some content providers) * Selective zero-rating (exclude some providers…
There's no such thing as paid peering, is there? There's only being a customer. DT wants you to buy transit to get access to their customers.
Just nearly everybody except Telekom is doing this on a liberal and informal not-even-handshake basis. On ISP scale, you either invest in infrastructure, or pay rent for network ports or cross-links, and you generally want your traffic usage to be smooth without spikes, and also go to the destination without going through your expensive ports more than once. So general connectivity is more important than any kind of traffic metering.