Celebrities as a single personas, with their personal brands - it's a great way to promote cryptocurrencies, but there are also other examples of crypto-related companies being promoted. For example you have sports sponsoring and there, crypto is really growing. I'm a huge fan of Wolverhampton Wanderers football team and their sleeve sponsor is CoinDeal, a cryptocurrency exchange. During home matches you can see their logotype on bands around the stadium. Imo huge sports organisations being sponored by crypto subjects can bring much more publicity than celebrities.