Hm. $50 million when the team has already been successful. Why, when only $1M would suffice? What on earth could $50M do? Remember the old saying: "Mo money mo problems" B.S.
Foundations are supposed to be self sustaining without actually selling anything, so they require large endowments to endure. That $50M could sustainably spit off as much as $2.5M/year, funding ongoing development indefinitely.