So I have noticed that there is a user (profile link) who has been posting a lot of large bounties recently. (See here, here and here). Upon further investigation, his profile description makes it clear that he is unhappy with the site and is leaving (note, contains swearing in his profile description).
The use of these bounties feels like a way to just screw with us on his way out. I realize that they are his rep points and he can do with them as he pleases, but this feels like a misuse of the bounty system. (For example, one of the linked questions already has an accepted answer, but states the bounty is because the question hasn't received enough attention. Another one states the bounty is because the question hasn't received enough attention and is also to award an existing outstanding answer.)
I'm not sure these bounties will really cause any harm, but it just feels wrong to let them stand. It feels like we are sending a message that we are ok with letting someone throw a fit and cause a mess on the way out the door.
So, what, if anything, should be done?