Stay at home moms with school hours.
Other shit that's not allowed: basketball hoops (permanent or mobile), trash cans in view, fence must by white vinyl and 6' tall (that's 72", right? some dumbasses got 68" fences that look absurd. Measure those and fine them, assholes), lawn water running at bad times (regulated by city, run at certain hours via reservoir, etc.), must submit any plans for yardwork or other external house work to get approval (like I had to submit my backyard getting sod. Really?), and more.
It's not a traditional HOA. It's called a Metropolitan District. I pay less for trash/recycling removal, and we have a water fee each year ($500ish) so I installed a tap into my yard's line. Need to water extra? Use that tap. Need to fill up a kid's pool? Use that tap. Need to run a slip and slide? Use that tap. I'm paying for it, and now I'm not using my house's water and getting charged per gallon.