They are probably matching users based on their usage patterns instead of hard data, which can only be fixed by limiting the amount of data your browser sends to a website to an absolute minimum to make it impossible to track.

But their website reads a lot like snake oil, so I'm not sure whether they actually have any technology or not.

Let your girlfriend use your computer too and confuse the hell out of them. That is how I destroyed my Spotify recommendations.

I'm all for corrupting their advertising profile for sure, but I wondered if there was a way to effectively block them completely. (probably not)

My guess is that if they aren't doing it already, that with the power of AI, they will be able to parse out the different users on the same profiles before long by how you use different services and will still be able to target you.

I hate when it feels like we are losing this cat and mouse game