@Xitel
i was thinking in more typical japanese terms about the gacha, like the balls with toys inside that people collected and still collects in Japan to death, more general things like the collecting cards for sports players, or just the typical farming for a specific item in any ARPG which is not much different from farming ''waifus'' in Gacha Order and similar ones if not going the PtW way.
Financial crisis begun in 2006-2007, but yeah, till 2008 it did not make it big.
There is no need for them to have a name or a legacy for them to be vtubers or the like.