Pewdiepie88 is 99% a scam account, if you don't get it you need to up your game, if he or she gives a coin it will not prove anything, can be to an account in his or her control.
Do you really think that a scammer is giving away thousands (sometimes millions) of satoshis to hundreds of users?
um, there could be milion of reasons for that, one for example could be that memo gods are forcing Memo popularity, eh!?
