Exactly. “Hey, we’re gonna let you use our network. But if you do anything illegal or shady on our network, we’d be held liable. So we’re gonna track what you do on our network to make sure if you do try something, we can remove you from the network and have proof.”
I mean, yeah, they’re also gonna collect advertising data, but do you really expect to have an expectation of privacy when using someone else’s network? Just like they can film you in the building, they can monitor your network traffic on their network.
If this surprises you, maybe you should do some more research on how a network actually works. And get a VPN. And maybe don’t connect to random public networks(you don’t even want to know what OTHER PEOPLE can do to you on those networks, nevermind the company).
Also, you pay for your cellphone service, right? Are you paying for the wifi in the store? Nooooooo. They’re giving it to you for free. Almost like they’re offering you something in return for that data monitoring. Like they’re offering you a service with a built in method to recoup costs… A service you voluntarily use and in doing so, agree to their terms.