AT&T drops ‘super cookies’ from cellphone data

I wonder if there were any startups that build the majority of their value prop off this data that is now going away:

AT&T, the nation’s second-largest cellular provider, says it’s no longer attaching hidden Internet tracking codes to data transmitted from its users’ smartphones. The practice made it nearly impossible to shield its subscribers’ identities online.

via AT&T drops ‘super cookies’ from cellphone data.