If 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.
If 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.