[Q]if i mark as 'not received', are there some penalties to giveaway creater???

Nothing spells romance like a sudden BAN.

I reported a person for not marking a gift received. They got a whole 3-4 days suspension. Almost 2 months, still waiting for support to add the value to my profile.

The number of gifts won doesn't show until he either marks it as received or not. So I'm assuming he won a 4th giveaway for which he still hasn't received his prize. If it's been more than 1 week since the giveaway ended, mark as not received. You shouldn't be doing any favors to people like that.

He does not get suspended for non delivery unless it's intention in the first place was to not deliver the game.

That means that if an asshole wins my game, I could rightfully not give it to him.