The original problem in Flint had nothing to do with money that someone could throw at it and everything to do with government corruption and potentially racism. Is the plan to privatize cities in hopes of better and more efficient oversight, giving Elon/Bezos cities to purchase?
Here is a list of celebrities and rich people who have donated to Flint, since you brought it up. It is not an insignificant list nor an insignificant amount of money.
https://en.wikipedia.org/wiki/Flint_water_crisis#Donations_o...
>> but we could easily just freight bottled water in far cheaper
This is being done by Nestle, and had been funded by many other rich people as well.
The headlines of "Flint still doesn't have clean water" are technically true, but the problem has a solution being applied to it. Upending all the pipes tomorrow by throwing billions of dollars at contractors to do it will cause the entire city of Flint to have no water instead of potentially risky water (despite testing showing that the water is almost entirely fine), so that's not a solution either.