The guys that will fight for this advertising space will buy again and again the same pixels, maybe 500 times per second the same pixel. Bch can't properly order as many transactions
There are plenty of ways to avoid that problem which does not exist. It will be a long while before BCH is doing 500tx/s, let alone a single pixel, please avoid logical fallacies.
Transactions in bch get confirmed in about a second. That's too much for 500tx/s if each tx needs to be sure the previous one was confirmed (which is the case here but not everywhere)