>>660352681152 MM JPY divided by 87 talents makes it an average of about 13.24 MM JPY per talent, per quarter.
That is an average of more than 90K per quarter for the average talent. That is a yearly middle class income, in one quarter.
Then take into account this includes holostars which means the top earners of hololive make a multiple more than that. If we take into account a graph from an older report, the top 20 talents make 60% of the revenue and if we estimate the 60% of the 1152 MM JPY thats 691.2 million JPY or 4.7 million USD shared among the top 20 talents in one quarter.
tl;dr: Many holos are millionaires