Are any of these grounds for a re-roll?

I've heard quite a few who have had issues with recent winners, so I wonder which of these, if any, are grounds for a re-roll:
-Winner is acting rude for not getting their key instantly ("Where's my ** key" comments)
-Winner threatens to not mark key as received unless received instantly
-Winner writes an insulting and/or threatening comment in the giveaway not directly related to receiving the key
-Winner makes insulting remarks in regards to the game in question, showing that they only want the game for cards and have no intentions of actually playing it ("Why are you giving such a ***** bad game, I only want it for the cards")
-Winner spams comments on your steam wall or in screenshots you've posted on steam in regards to not getting the key instantly
-Winner entered one of your other giveaways through a leaked link and you can prove it

Clarification on the last one:
The winner of the giveaway did not enter the giveaway they won through a leaked link, but entered another giveaway of yours through one.