I can confirm that my son did not like being a "default" and wanted me to give him vbucks so that he could avoid this shame. I think it's ludicrous, of course, so I didn't. But I think one of his friends might have gifted him some, or he played enough time so that the system granted him some non-default skins. Also as a side effect of buying the "save the world" edition I think he got some skins.
I knew it was a mistake to consider games with lootboxes (the Star Wars one) and play-to-win games, but I'd hoped/assumed Fortnite was not like those. I guess I'll have to keep an eye out for things getting out of hand w/Fortnite.
EDIT: lots of speculation regarding the genesis of this phenomenon among these threads. I should note that my son (and probably his friends) all watch youtubers who play fortnite and some of them seem to refer to 'defaults' with derision. "Did it start there or have they just gotten caught up with the same culture?" I don't know.