They definitely entered into that contract without duress.
But the majority of other neighborhoods are also run by HOAs with similar terms. There are a few neighborhoods that are completely free of HOAs that but those houses are not as nice and neighborhoods not as nice. If you want a nice house in a nice neighborhood, an HOA is your only option.
I'm positive some people, if they had the option, would prefer to buy their current house free of the HOA. Others, on the other hand, like that HOA protects their neighborhood and don't care that they can't paint their house a different color or buy TV's directly from manufacturers.
Sadly, the house and neighborhood you want determines whether or not you'll have to enter into that contract with a particular HOA.