The Durable Internet: Preserving Network Neutrality without Regulation
cato.org
cato.org
As a counter example to this, a very popular cable company where I live offers VoIP phone services, and lowers the packet priority of competing VoIP vendors.
2. Does it matter?
Consumer-grade cable service is so fast and such a big pipe these days, voice doesn't really require handling with kid gloves anymore.
If you would prefer, we can treat the situation as entirely hypothetical. Do you disagree that a cable company with a large market share offering VoIP services could profit from restricting bandwidth for other VoIP services?
First, there's a signalling problem. Users buy Vonage, it's terrible. Why should they believe anything the incumbent ISP says about VOIP, unless the ISP fesses up to meddling with their traffic?
Secondly, how will they identify VOIP traffic ? If such practices become pervasive, folks just won't use plaintext SIP/RTP anymore.
With regards to identifying the traffic, that may be a valid concern and I cannot claim the knowledge to argue with you about it.
However, assuming the ISP were to discover some practical way to identify the traffic, it stands to reason that they could profit from reducing their bandwidth.