You wrote: A common fallacy that I have seen in advertisements is that of appeal to authority, where the product is advertised by a celebrity or known company to make the product seem more credible. Matt Damon was in a now infamous commercial for bitcoin. In an article by the Associated Press on March 27 he appeared somewhat ashamed that he was in the commercial. He explained that the reason he did it was mainly because his clean water initiative, Water.org, was in dire financial circumstances, explaining:

”We had a down year in Water.org, and I did that commercial in an attempt to raise money for Water.org.” I'm glad that Matt Damon understood that he was in an ad that made him look bad to those that took his advice and got into bitcoin. Cryptocurrency has frustrated so many people, including me. For a week or two, I got involved in it, and found that it was not a good investment of money or time for me. Even Elon Musk is doing things to elevate his personal Doge-coin, to include calling his new gang of House Republicans the 'Doge Caucus'.