There are good theoretical arguments against this in the comments, but I wonder whether in practice there have been occurrences where ads were useful in challen

There are good theoretical arguments against this in the comments, but I wonder whether in practice there have been occurrences where ads were useful in challenging the scientific status-quo and advancing science? It seems like in practice, this policy is primarily designed to prevent stupid politicians that deny science to advance their agenda or maybe snake-oil vendors that use ads denying science to sell their shit. Both of those are a good thing to me.