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Thank you Daltonik for sharing those bonus codes with us!
The first code ($3) is still working. I just redeemed it and $3 were instantly credited and added to my USDO balance. Unfortunately, the $12 bonus code (12NOW) has expired. Anyway, if you claim the free $12, the maximum you can withdraw from your winnings is only $25 (according to the article you linked) but it's still free money so can't complain.
The only inconvenience is that you can't use the money you won from free spins to play any game you want. You can play only the games on the bonus mode.
I just claimed it too $3 and consider this bonus useless can only be used to buy spin not buy future keep repeating until the balance runs out
Even I don't agree it's called a bonus to be more precise a trial balance no difference with demo mode, but it's okay if it's just for fun
Or maybe there's something wrong with the way I'm using it?