If you want to collect free bonus they exist and can make profit from them. Such offers come as with free bets or no deposit bonus. With free bets you play always on slots and there are set number of Free Bet No Deposit usually with specified bet amount to win. In no deposit you have to start with cash in currency like $10 or $25 and you are restricted usually for slot games. You can bet for your choice of amount you want to.
How does it works
All the casinos give out these offers always to have maximum cashout or win maximum amount that comes with wagering requirements. When you win 10 pound free bet no deposit it is often to withdraw up to certain limit. At all casinos you have to make certain deposit before withdraw cash even if it a minimum deposit of 10 pound, actually it is the standard requirement and you are asked in their KYC documents. It is the proof of your identity and any further information is asked you should avoid it.
Free bets and no deposit bonus
People can ask such question regarding free 10 no deposit required but they really are. Every 20 players who sign up ask for this offer out of that one may win and usually they get players for their site that earlier were not coming therefore it is promotion. You as a player play on 100 to 200 casinos where you can claim such offers and playing more of it increase the chance to win. Some casinos with these offers find excuses to pay off when you win and ban your account or slow down your play to avoid wagering your win. So such sites should be avoided as you win a jackpot with the money deposited and you are not paid back.