The vast majority of services use email address to identify you so diversifying your email addresses helps a lot. I&#x27;ve known about every hack&#x2F;info leak ahead of everyone else for that reason - I use a unique email for every service.<p>I also use different cards for the major online retailers &#x2F; tech giants so knowing the last four digits from my Amazon account is useless to validate anything else (though this does require having several credit cards or debit cards).<p>Whois privacy is absolutely required.<p>Unfortunately if someone is determined enough, almost all ISPs, cell companies, retailers, etc will happily give them control of your entire digital life. You can only minimize the risk somewhat.