That is a good ROI. Pretty cheap too. Especially compared to the amount of money Cambridge Analytica and SCLE have charged for doing exactly the same in other countries elections and referendums.
Just to be clear - they (and their ilk) will still be allowed as they interfere in elections "in the direction we want". It is only the Russians who will be banned from buying ads in the future. It is the reds under our beds, you see. If it is brown, white or any other color, they should be allowed. In the name of "democracy".