They're tampering with the expected operation of the browser so that even after the user explicitly told them not to it still sends personally identifiable tracking information to their servers.

I'm glad the GDPR is in effect, so instead of "this should be illegal" we can say "of course this is blatantly illegal".

I hope they get a fine for this, with multipliers for how deliberate it is, and for keeping on defending the behaviour even after being called out.