That was in Europe, and for "non competition", not breach of contract as I'm suggesting.
Also, "nobody will sue me" does not mean you're doing the legal or moral thing.
It means there is no legal basis to do that. You were asking if those arguments could stand in a court, they already did. So the answer is: YES
2. When has ignorance of TOS being upheld in court to invalidate a contract with regard to ad blocking?