It means please or like a puppy eyes… i use this when i want something usually to ask for a favor.
The Pleading Face emoji ? also variously conveys sadness, guilt, cuteness, and even arousal.
It surely isn't used as one, but it indicates puppy eyes that are used when pleading someone to do/give something.
‘?’ is also used as a “cute emoji” although it's the complete opposite of it's actual purpose.
Two ways it's used:
“Please just give me my chocolate back brother ?”, said the 4 year old girl.
“HI uwuwuwuwu aren't I so cute oily london oppar uwuwuwuwuwu????????????????????????????????????✌✌✌✌✌✌✌?????????”, said the cringey uwu girl.