The parade may affect locally, but on a general scale, it won't be effective in solving the whole issue. Gambling addiction is complex, regulations are required to prevent and measure it widely. So only by judging based on a single unknown video, the effectiveness certainly can't be measured precisely.
Affect locally, both positively and negatively imo. Positive effect, the parade may make people aware about the dangerous effect of gambling. Negative effect; the parade is introducing gambling to people who have never knew about it. Coming up to effectivity, it is depending how the parade present it to piblic as well as the level of awareness from the people who watch the parade.
I agree. It depends on the understanding of the people that are seeing the parade. Because if they already have experience or idea about this particular slot, this parade can influence them to not let themselves gamble without control or at least be aware of the risk of becoming addicted.
However, the curiosity of people can also lead to try this game so this parade is not sufficient if they really want to warn their people about gambling. There should be a seminar where the leaders can clearly explain the positive and negative effect plus the worst that can happen of a gambler who don't have discipline.