In most cases, many celebrities do not understand what they advertise at all, although it often happens that people just get their money for it and move on. But in any case they are not responsible for this.
I totally agree with you . most often for them advertising is part of personal income. Perhaps they just want to keep up with the times, and show everyone that they also understand the cryptocurrency . Now it is possible to be advanced. At all on hearing bitcoin, just not everyone understands what it is and what to do with it. But for the crypto currency, it is in any case advertising, which will not hurt