Given that hardware encrypting/decrypting is omnipresent, is it really that much more expensive to stream content securely? I'd like to see the numbers, but I just don't think it's actually a meaningful increase in cost. Network traffic itself tends to be the dominating factor in cost, with encryption just upping your electric bill slightly.

It seems like the benefits of transmitting your streaming securely (e.g. defeating interloping ISPs) more than exceed the costs, hence why they're doing it.