I still dont get why ICOs do not get the idea that Brand needs to be built, and is bases upon many pillars, one of which is reputation. Having your brand name tossed around in the hands of spammers is plain silly to do.
Normally, in social media, one would measure concepts such as Brand Sentiment (detecting whether the brand is perceived positively, negatively or neutral), Notoriety (number of media or in this case posts where your brand is being mentioned in) and so on. Focusing on Notoriety without looking after Sentiment is kind of old-school (let them talk about our brand, be it good or bad). Sentiment should be a focus, and that should be built by the message that the Brands hired hands (posters on this case) carry. Spamming only differs one letter from scamming and this similitude kind of settles overtime with the wiser.
Since the Forum wants/needs to have signature campaigns, perhaps it could create a proprietary logotype that enhances the visibility of those campaigns that explicitly and voluntarily commit to an anti-spamming policy, just as we have logotypes for safe e-commerce, green power, ISO certified and so on.
This proprietary logotype could be use by campaign managers who compromise with an anti-spamming policy, alongside their signature campaign, as a complement to the signature for their signature bearers (it would probably need to be a separate field, so that it could be switched on or off and not embedded along with the signature itself).
This would probably also need to be overseen by some forum representatives such as DTs for example, with the ability to hide the forum proprietary logotype if the campaign does not comply with its anti-spamming commitment.