The celebrities are very influential and lots of youths idolize them, and encouraging gambling would be conveying the wrong message. Although it may be legal, it may still promote unsafe behaviors, particularly to teens that are most inclined to risk taking having little awareness to the consequences. They should also do something positive on their platform and not on something that may end up affecting their audience negatively over time.
I have some celebrities that I like very much but since I have been on this earth, no celebrity I ever like and favorite has influence me based on my choice of things. If I like you as a music artist, your influence stop at my choice of music, I can play other songs but I don't think twice before I play their own and similar to other actors and actress but influence me based on product and things they don't even use, I don't waste my time to skip them.
If there is any person I detest so much with gambling is Drake, man has turn to full time gambler and doesn't look like Toosly guy I used to know, it's either today he post about his weekly rollover bet for the week or he shows money he loss and I'm like, joy did all this in silent and then decided to share the result online because it's stake casino? Like I don't get. With all he does, he has never influenced me to use a casino, no matter what they do I see them as music figures.