In FL, MS and NV, the amount of free play is the threshold for cashing out any "winnings". If you have $25 in free play, once you've gambled $25 in the machine, the residual (if there is any) is yours to cash out.
I don't know all the match play rules. I play table games on occasion and the "winnings" on any successful, matched bet were immediately available to take with me.