Mcafee is known for making predictions about what will happen to a specific cryptocurrency or ICO in the next months or years. He is a believer of Bitcoin and spreads good words about it which is good for Bitcoin, but everyone knows why he is doing it. It is because aside from investing on it he also mines Bitcoin, so when Bitcoin gets more value, he will of course benefit from it. He also make money to promote ICOs before (idk if he's still doing it). He talks a lot of good things about cryptocurrencies especially in Bitcoin but of course predicting the price of cryptocurrencies is impossible so no one should rely on predictions even if it is prediction coming from an influenced person or group.