Yeah these sorts of practices seem to be everywhere. I have Comcast Business (for internet) at home, and even for that, they want you to use their provided cable modem + "security gateway". I told them I wanted to use my own modem and router, and they told me that would cost more! I can only assume they gather data about your home network and sell it to third parties, and don't want to lose that revenue stream. And I assume that device also broadcasts that "xfinity" public WiFi network as well.

I of course think the practice is disgusting regardless, but it surprised me that they'd do it on their business-class product too. Would be really nice to see some regulation aimed at prohibiting this sort of thing.

(To be fair, I recently called Optimum for cable internet setup at another address, and told them I wanted to use my own equipment, and they still gave me the same price. At least some companies aren't engaging in this bullshit. They did try to upsell me to a much faster package than I wanted, and tried to get me to add their cellular product, but I guess that sort of thing is a normal practice anywhere, and at least the sales rep wasn't pushy and it was easy to say no.)