Your provider does not force you to install their sniffer on your computer, to use their service. Your (and my) provider does not know, what game i play when, how long, what i do in there, who i talk/text to, what hardware is in my computer, what OS is installed, the patch level, and any installed software. Valve publicizes reports generated based on this data (of course just very basic statistics), but there is also no way of preventing them from collecting that data. A provider may be forced to collection connection-related data, due to your countries law, but that again is (usually) tightly regulated. Valve is a US company, their data protection policy is something like a joke, look at EA's Origin, and see what happens if people start reading those EULAs.
Regardless of that: just because others do things too, not make it any less despicable

. If you pirate a game, it's not less wrong, just because others to the same constantly. If i you rob a bank, the fact that others did that, does not make it less a crime, now does it?