Not sure what to say about this.
Marketplace section is usually quite active. Staff can't instantly follow up on early bumps. When seen, they do get deleted. If you happen to see it before a minion gets to it, you can simply press the report button to notify all the minions and global moderators about the post. It will then get handled.
Similar answer as above. Press the report button if it hasn't been handled already. As for people giving them away for free, they're at a total loss. The vouch won't count since they don't meet the requirements.
It's not like the minions know by-heart who created what hack. Usually if it's reported, we can ensure proper credits are being given.
It's a hack. It doesn't need a full lengthy blog post about it. As long as it meets the uploading rules with 2 virus scans and screenshots/video it's fine.
Probably because your judgement is wrong or the report is invalid. All reports get looked at by GM+ anyway.