The Guardian is suing adtech outfit Rubicon Project for breach of contract

The Guardian has started legal proceedings against adtech firm Rubicon Project after it allegedly failed to disclose fees earned from advertisers that appeared on the publisher’s site.
The media owner confirmed today (28 March) that it had “commenced proceedings against Rubicon Project for the recovery of non-disclosed buyer fees in relation of Guardian inventory”. It declined to share any more detail on the move, citing legal reasons.
It comes just months after the Guardian&rs