Sometime who worked for an advertisement provider told me it worked well as a signal, though. This was before it was obsolete. So few people used it that it helped identify its users.
(His employer explicitly ignored it. They used an ML algorithm to assess signals, but they overrode that particular assessment as soon as they discovered it.)
Complaining about it is even more tiresome, also useless. Also, at times the accusations are false. Worse yet, sometimes the accusations even are motivated with by those with a conflict of interest who want to suppress the information.
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