[grok2]

A lot of tracking happens through other means so that Internet advertising agencies (Google/Facebook/etc) can show targeted ads to you across networks of sites. Having the data from the ISP allows them and others who need the data to better fingerprint you and show more targeted ads. But apart from advertising, isn't it conceivable that if the law doesn't forbid it and there is a buyer for your data, that ISP's would sell it to make easy money? There was that recent news of how Uber was buying Lyft email receipt data from a company whose product helped it's customer's manage their email.