> However, phone hashes are sent, not clear ones. Somehow, the knowledge that the efforts to tie every trace of my existence together to help marketers target

> However, phone hashes are sent, not clear ones. Somehow, the knowledge that the efforts to tie every trace of my existence together to help marketers target ads to me are done in a cryptographically secure fashion is not entirely comforting. In general, I have been unimpressed with recommendation engines of any sort. Spotify can't suggest music I'd like worth a damn, and it's working within a relatively specific domain. Whatever fractional gains in ad relevance are currently obtained from this aren't worth the privacy invasions needed to obtain them.