You can only leave by selling your house which is what they did yes.
Freddie and Fannie won't even underwrite loans if the HOA dues are that high. That takes 70% of home buyers out of the market.
With no buyers and no ability to pay the HOA dues, homes go into foreclosure and the HOA gets to take possession of the homes.
This is beyond evil and states need to outlaw this behavior.
1. Get control of 51% of a HOA.
2. Raise the fees to an unaffordable level. Trap 49% of the homeowners, and foreclose on their "debt."
3. Get control of the other 49% of the properties, basically for free.
4. (speculating) Dissolve the HOA, and return its "assets" to the "owners" (you), so you get all the fees you "paid" back.