The grant rewards have been computed using this framework released on Jun '21, which is using a 20-day moving average price. I hope that all grants contributors have had a look at it.
It’s a methodology used in the space (see also IndexCoop) to pay grants and ensure consistency for all contributors (getting the rewards today or in eg 5 days, using the spot price, might make a great difference).
Using the spot price might give a sense of exactness now, but it won’t ever be accurate later as we’re in a volatile environment. The goal of using a rolling average is to dampen volatility. If you think in the opposite scenario, with avg price < spot price, it would have discouraged anything? We need to consider all the possible cases. How would you improve it?