I meant when viewing from an address overview. If you see a transaction of 1000 satoshis randomly appear in your wallet, are you going to open up the specific transaction, view the other outputs, and decide to scroll down to see what the OP_RETURN is when decoded? You're really overestimating how much people care about an amount that isn't even a penny.
Why did I write the post? Because this is misleading:
People will receive 1000 satoshis and will see your ad in their wallets or block explorers.
Electron doesn't show other outputs; you have to specifically look at the transaction details. I don't believe BitcoinABC does either. Could you clarify on which wallets will show unrelated OP_RETURN outputs by default and in a clear fashion? I bet that the majority will not see your ad.