alt Hacker NewsIf you use both from the same IP without using a VPN… the profiles are most certainly grouped. There are commercial datasets on IP addresses with almost 100% accuracy with tags like “school”, “house”, “apartment block” etc. Furthermore, if you ever logged into both sites from within the same browser by accident, the link by fingerprinting was made right there and then. The final profile on you may not be 100% accurate, but certainly is in the 98% range.
It's one thing if they have a shadow profile on you (and dozens of companies almost certainly do), but it's another thing if you give them meaningful info about you to enrich that profile with. They can figure out roughly what block you live on, OK fine, but unless you're in a rural area with no neighbors they might not be able to do much better than that.