2) Penalize bounty campaigns and ICO's that use bumping by shit-posting by displaying their thread permanently on page 10 or a special penalty page which reduces the size of their images and fonts.
It is not necessary to use ICO bumping service. Some of them can just combine their ANN thread with bounty and ask participants to provide weekly reports as a new reply to the thread. It will not violate such rules and still provide the necessary pumps for the ICO. Forum restrictions won't help in such cases.
IMO the best way is to create a website with a decent SEO that will have a garbage / shady ICO listing that will be shown at the first google pages. Their PR managers should see that shady activities may lead to fail, otherwise they will keep spamming the forum.