I must be getting old, never? There's a lot of techniques like doings stats on blank pixels and such that have been around for a long time. A lot of ad blocking

I must be getting old, never? There's a lot of techniques like doings stats on blank pixels and such that have been around for a long time. A lot of ad blocking techniques start at the DNS of the hosted resource, so having a single domain for everything (if practical) can present some reliable information.