Okay, so they have cookies on a subdomain of the main site's domain. But that in itself is not a problem, since it does not enable them to track me across websi

Okay, so they have cookies on a subdomain of the main site's domain. But that in itself is not a problem, since it does not enable them to track me across websites. So I don't have a problem with that, unless they use other tricks. Are they using browser profiling or something similar to correlate across websites?