Games like this have actually been popular for long time, such as games where you spin bottle on the floor or on table to determine the winner, but games like this are not for gambling but just for fun doing challenges with friends or family.
If it is related to gambling, this game cannot be used for gambling because anyone can do it and it is faster to spend money when someone plays with money, besides I don't think anyone will ever want to play with money in this game.
How is this topic related to gambling or gambling discussion? This is off-topic.
On local gambling sites, I do not see any gambling like this. On crypto gambling sites, there is nothing like this. This is just to make fun and nothing more. This is not about gambling except people that will use it to bet among themselves.
Let’s remember that gambling comes with the unknown outcome that may or may not favour you. This game is just about the same. On TikTok, I’ve seen people play the game and it always has a price (but you’ll lose nothing other than losing your turn). But OP has mentioned that they actually bet real money which means someone has the potential to lose their money or win money, hence, it falls under the gambling discussion.
So, like on TikTok or other social media that broadcasts this game, it is only for entertainment, not for betting.
I still doubt whether the people in the country OP lives in are really gamblers who can't play other games and so use bottle flip games to gamble money.
I personally would never place bet in this kind of game.