That is what they say so as not to get into any trouble if the crypto they are shilling crashes so bad. Following anyone's advice is always at your own risk, but it doesn't exempt the person who popularized the idea from blame, especially when the person is a celebrity who knows that many of their followers listen to what they say. I know we enjoin people to: "DYOR", but i understand some of them do not know how to accurately do that, so they fall into the hands of some of these influencers who pitch scam/bad projects to them which doesn't end well. Thus even if investing is at your own risk, i think influencers should also be held responsible for promoting scams.