DJ Khaled and Mayweather had an issue about shilling an ICO. And other celebrities hyping or promoting scam coins. Who would actually rely on their words? If you're listening to celebs then you are not ready for this type of market at all.
I would actually believe if the one who promoting ICOs or alts are Mark Zuckerburg, Bill gates, Ellon Musk and other celebrities who has a great knowledge on technology and really understands the concept of bitcoin and its market. Other celebrities or artist are just like promoting a beauty product which they never use, because thats what they are doing.