This may well be true, because, as you write, the video often showed big wins in online casinos. What if this could not provoke other gamblers to play? Guys go to YouTube to watch videos to gain additional motivation to stop gambling. But suddenly they watched the video and watched the trigger moments, winnings. Of course, this should not be shown in such videos about how difficult it is to quit gambling. I am sure that this video clearly had the intention of reminding former gamblers again about how cool and fast you can earn money in gambling.
The truth remains that a YouTube video isn't enough to switch an addict to responsible gambling. Whatever keywords that was used to promote the clip is supposed to be a click bait to derive views and traffic to the creator. However, it's not right to direct players into the wrong directions, but that could be a means the creator wants to make money in gambling. Instead of saving problem gamers, he makes profits through them, although the watch time might get affected because some people after seeing the content won't watch till the end.