Not so familiar with impressio but it's sad that there are bounty campaigns which suddenly disappear with no trace. There's not much that bounty hunters can do even if they have their done their part and put into effort in participating in the bounty campaign. Once the developers and campaign managers leave without a word, the bounty hunters are left with nothing but dust and they can't do much but complain. It's even more difficult for those who invested and put money into the ICO project because there's hardly any way for them to recover their money.