At any point in the future? Only during (I)POs, you mean? (regarding reinvestment in cryptx)
You could just buy more existing shares at market price at any point, but indeed for peta to grow, they should simply issue new shares representing new hashrate regularly.
But then you don't know who's going to invest how much and how much hardware that buys. Then it becomes too risky to reinvest at all. Knowing upfront how much reinvestment we'll have is key to success?