Sam Altaman says: 90% of funding was needed for compute power, but also was needed for things like buying dataset and then to pay employee so that they can compete with likes of Google to retain them. If they would not have done this, then very soon they would have become irreverent.
So to retain the earlier intent (for greater good) they put in bunch of 'safety features' around funding - Ex. 'Profit Cap' - after 100X the profit would be distributed to the world (in some way). Similarly, there were few others he talked about.
The relevant portion starts at 32:39 mark in the following podcast: https://open.spotify.com/episode/3oOX1QHLPw9uvLL5LmBk28?si=s...