Whether you're playing real casino games or free casino games, the RTPs (return to player percentages) are fixed. There is nothing that can be done to change the house edge in casino games. Casinos do not intentionally manipulate demo games to payout more frequently than real money casino games.
Demo slots let players spin the reels for 10 to 20 times and determine how many winning combinations they can land. They can also help avoid financial losses and improve their game-playing skills. Free slots can also help novice players or players who aren't experienced practice winning strategies.