here in the uk, some of them do good conservation work and keep the animals in relatively good conditions
my local wildlife park for example has very big enclosures that are all grass and foliage instead of the concrete pits you see in a lot of them
they make sure the animals are properly stimulated and not sat around bored all day
they also don't really care if you complain about not being able to see the animals because of all the greenery lol, as I found out when i overheard a parent argue with a zookeeper once