Hi Jeroen,
So I guess that all these providers will apply nice "QoS" to the well known speedtest prefix, while still applying negative "QoS" for the competition, or by not doing proper peering etc etc etc...
Isn't that already the case for some providers? I always tell customers if you use Speedtest, the only thing you're measurement is going to tell you is: How fast is your Link to Speedtest (or whatever you use). This, most of the time, does not reflect any real-time scenarios...
Also, it seems that there are monopoly providers who are present at IXs and won't peer then with other ISPs, thus.... not very useful all that, as the speedtest will be amazing, but the actual packets to the other ISP will fly over timbooktoo...
AFAIR, we do already have this situation with UPC....
In the end... if you choose the wrong provider (especially as a service provider) and find out later you're in for some massive work (renumbering, most of the times). I am currently evaluating new links here since we're going to have FTTH soon. For private users it's relatively easy to change.
Most of the time, the end-customer unfortunately won't really get what's wrong anyways. "I'm with <put big provider here> so it must be good" is what I hear quite often.
Tobias