How is Comcast worse? Their monthly cap is about 20% higher, and if you are willing to use their modem/router you can get add unlimited for around $11/month.

I'm guessing you are currently using AT&T's modem/router because you mentioned frustration that your router does not support throttling, which if you were using your own you could address by simply buying a router that does.

You do this by getting their XFi Complete plan. It's $25/month on top of your base plan, but it includes both the modem/router rental and unlimited so is only $11/month more than a non-unlimited plan with a modem/router rental ($14/month) on top of the base plan.