How does this work for areas like Texas where most of the suburbs are not in the cities that are supposedly subsidizing them? An example would be the outskirts

How does this work for areas like Texas where most of the suburbs are not in the cities that are supposedly subsidizing them? An example would be the outskirts of Houston where the residents pay for their own utilities through MUDs: https://www.houstonchronicle.com/news/houston-texas/houston/article/Municipal-Utility-Districts-in-Texas-have-9175418.php?t=ed730e9c63438d9cbb https://www.houstonchronicle.com/news/houston-texas/houston/... It may not be sustainable for them, but it doesn't seem to be subsidized by the larger city tens of miles away.