I totally agree with your assessment, Erik. I think it's ridiculous that Rogers is able to do this, not to mention the fact that they're labeling it as an "improvement". But I don't think it's all about the digital cable security, I definitely think that's part of it, but I also think it's so that they don't have to upgrade their hardware.
A lot of people have been noticing that they're not getting what they pay for in terms of data speeds from Rogers. Rogers can now mitigate this problem by limiting individual's bandwidth, rather than improving their infrastructure (at least for a time). THIS is my biggest issue with Rogers: their willingness to sacrifice customer experience so that they don't have to spend money on improvements as the internet grows. Add to that, they're taking advantage of people's lack of knowledge when it comes to the internet and calling it an IMPROVEMENT.