[Oddskar]

You forgot a pretty relevant part:

Hashed MAC address: a cryptographically (SHA256) anonymous and unique ID for a machine.

Although I disagree that they should have this to begin with, it being anonymized is still a pretty important detail.

[craftinator]

The important part of them having the MAC address is that it IS a unique ID. If it wasn't a unique ID, then it wouldn't matter if they had it, because their purpose in taking it is to identify you. So whether it's hashed or not is completely irrelevant.

The fact that they are taking uniquely identifiable information from you, and the fact that their company is as deep in the Ad game as Google, is more than damning enough.