Yes. However, normally when conditions change, people are given the choice of opting out of the contract at no penalty. Treating these people second does apply a strong penalty.
What's more important, Dooglus stated (yesterday) that whoever decide to drop their sig , will get paid for that period:
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I would recommend that everyone who is concerned that DB is a scam should stop wearing the DB signature completely, switch to some other campaign, and at the end of the month we'll pay you out for the 9 days you wore it for.
Then you don't need to add a disclaimer.
It seems unreasonable to expect anyone to pay you for advertising a site with "this is a scam" tagged onto the ad. Even if the rules don't explicitly prohibit it, common sense does. Why would anyone pay you to say they suck?