The tip is held in his SteemTipper balance, which is tied to his social media account. If he doesn't log in with his account in seven days, the tip is credited right back to your balance instead. If he does log in but has no crypto wallets, that doesn't matter either... He can use his balance to send tips himself. If he wants to withdraw his tip balance, then he'll need to get a STEEM account. We're looking into other ways to withdraw, but to start, he can participate/collect/tip without any special accounts other than his social media.