Celebrities in cryptocurrency market doesn't interest me. Also persons like McAfee that wants to affect the whole market. It is clear that celebrities gets paid to promote projects.
I have got the same opinion, they're just got to promote cryptocurrency idea to bigger amount of people but they not provide trust itself by only just promoting coins or tokens.
Mainly it's true but I'm sure there are small number of really good celebrities that want to overview really worth projects. Most of them talk about Bitcoin but some of them believe in altcoins. In any case, it is best to rely on your opinion and not listen to others.