In practice, charities don't really invest excess money or take out loans to spend money sooner. I'm not sure why. Possible explanations:

• No one will lend much to charities, because they don't have much collateral and their income expectations are so uncertain. Or this leads to very high interest rates.
• Investing money instead of spending it looks bad and is visible externally through things like the US Form 990.
• You're required to spend at least X% of the money that comes in each year.
• If you take a loan, having already spent the money makes it harder to fundraise. People want to pay for things to happen.
• Investing extra money signals that you don't have room for more funding and so should get less money in the future.

Regardless, if you're thinking that your decision doesn't matter because the recipient can just do X or Y, and it turns out X and Y aren't really options for them, then your decision does still matter.