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.
Cryptocurrency is becoming more popular all over the world, that is why even celebrities start to have an interest to invest their money in crypto and they are starting to promote and advertise it for more people will be interested to invest.