For sports: referees, coaches, and athletics maybe tempted to compromise or manipulate games for financial gain, gambling introduces corruption and match fixing , uncompromising the integrity and fairness of any competition.
I don't on other sports, but basketball particularly in NBA is combatting these game fixing and game manipulation just for the sake of winning on bets. The recent incident was on Jontay Porter. Just make quick search on it online and you will find many articles of it. Maybe there are some sports where game fixing, game manipulation and the like are very rampant, but it's up to the management if they will allow it or not. I mean I believe they can do it.
Moreover it can also promote aggressive behavior violence, especially when fans lose significant amount of money.
Additionally, the presence of widespread sports betting can lead to issues with underage gambling, exposing younger audiences to its risks. In the long term, gambling in sports can erode the spirit of fair competition, reducing the enjoyment and value of sports as a cultural and recreational activity. This is my own opinion.
As for underage people who are gambling, there's nothing we can do about it if their parents can't help them. With how easy it is to access gambling sites online, there's no doubt that they will gamble especially if they're curious to try it. As for aggressive behavior, I don't know, but the people who are only doing this are the ones that can't even control themselves especially when they lose money. Can't blame them, but I hope they're ready for the consequences when they did something violent.
What are your opinion towards negative impact of gambling in sport?
As much as I want to say positive things about gambling, I can't think of any. My opinion? Sports gambling will stay no matter what happens. Some sports are even advertising them.