However, most of the casinos will impose restrictions on free bets wins to prevent players from easily cashing out large amount out of the casino. One way to stop them is to increase the wagering requirement [...]
If you are a regular gambler here on the forum and see that the project holds a lot of simple and clear raffles and contests, I don't see any problems with making a deposit of 5 bucks... just so that the system recognizes you as a real player and not a bot.
I also don't see any problem and agree that there should be some wagering requirement to withdraw free bet winnings. I feel uncomfortable when the required amounts are too high and perhaps don't even compensate for the minimal winnings. Furthermore, I think $5, even $10, are reasonable amounts in this case. Free bets are a way to attract gamblers, not adventurers who will register on the site, redeem the prize, and then never use it again...