Get a job, that's the best way to do if you want to earn $0.5, even you live in third world country, I believe you can earn that by just working for one day.
What you need to know is you need to pay fees when it comes to withdrawing cryptocurrency, especially in centralized exchange.
Thats exactly my point. So ... what to do ? I dont wanna pay them 20 bucks to get 50 cents back.
Is that even legal?
You can sue Bittrex if you want.