Yeah sorry but this just isn't true at all. When the browsers started blocking or otherwise crippling third party cookies by default a few years back, lots of c

Yeah sorry but this just isn't true at all. When the browsers started blocking or otherwise crippling third party cookies by default a few years back, lots of companies changed how tracking works to get around it. I know because I did it for a company I was working for. Instead of being able to use a simple tracking pixel hosted on a third-party server we changed to having websites embed JavaScript hosted by us so we could set a first party cookie. I don't think any respectable tracking uses third-party cookies these days because they just don't work well at all anymore.