That's about Google's entire revenue for 2020. I don't think even Google could put a man on the moon at those rates. Literal moonshots are expensive.
So it wouldn't be insubstantial, but they could fund a similar effort if they really wanted to. Shareholders would have a thing or two to say about that though, which is why Elon Musk is keeping SpaceX private.
https://www.cbsnews.com/news/apollo-11-moon-landing-how-much...
as a percentage of the yearly federal budget, it's not that extreme.
I believe the DoD budget (entirely non-NASA) is presently running around 700 billion a year.
some very quick searching tells me the total federal budget is something like 3500 billion a year. 4.4% of that would be 154bn a year.
And SpaceX will soon have the capability to do it with zillion times less. Seems like if you really want to make it possible, you can.
I prefer to think of a moonshot as longer than a longshot, whatever that might be worth.
It sure is sad though, coming from the acquisition before Google X that had just so many great players throughout.
No Saturn V rocket ever failed.
But unfortunate though that was, it didn't represent a fundamental uncertainty in the achievability of the goal - simply a fatal engineering mistake, which was immediately rectified.