That's a fair thing to be worried about, and I think if this were to move forward I'd really like to see at least one other browser implement it to the same sta

That's a fair thing to be worried about, and I think if this were to move forward I'd really like to see at least one other browser implement it to the same standard, or perhaps some agreement on what constitutes "bad" ads from a few other networks. But I don't think that's a good reason to fight it from the start.