what's low supply x) only POW supply
but total supply is 500M ? that's big supply

if released after POW phase
It is not big, it is more medium in terms of total supply and it has to be that way with POS because the dev wanted a high interest rate. POS with high interest will not work well with an extremely limited supply. So for a POS coin, 500 million is reasonable. This is not meant to be bitcoin.