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Why not buy your own router instead of using Comcast's? I don't believe they can do that if you buy your own router. I bought one years ago and I'm glad I did.
Amazon has a big selection of wireless routers, so you should be able to find one that will meet your needs. I'd dump Comcast's router in a heartbeat if I was still using one.
You can opt out, but while I understand your reaction, in some ways I don’t think there is too much to be upset about here. What I don’t like is Comcast charging customers for the hardware (and charging them dearly), then using the customer’s hardware for their own purposes. That’s more of a philosophical problem that a functional one though. One legitimate area of concern is that this is going to cause signal clutter, especially in areas of high density housing. This could cause performance degradation. There are only so many wireless channels, and these are going to be overlapping in urban environments and apartments, especially since in many Comcast markets, you have few other choices for ISP.
The main issue I have is that I simply don’t trust Comcast to have any concern for their customers’ interests. If they want to do this and customers don't want it or are negatively impacted, I frankly don’t expect Comcast to care one bit.