I think the argument that Quickseller is on referring too is that if an announcement thread was trashed for this without offering an incentive to post competitors of the ICO/Altcoin could sabotage other projects like this.
These are of course valid arguments. But meanwhile many threads have thousands of useless comments, all competing to be on the first page. Worst spammer wins!
SuggestionWould it be possible to ignore Newbie-posts when sorting on "Last post" in the Altcoin boards? That would make it impossible for a Newbie to bump a thread (while they can still post). If needed, this can be increased to higher ranks too.
That would work. It would make the use and throw accounts created just for the purpose of bumping ineffective.
But it seems to be a solution tailored for this particular problem. You would introduce a layer of complexity, without attacking the root cause.