Celebrities Mayweather and DJ Khaled have both been charged by the Securities and Exchange Commission for failing to reveal they were being paid to promote initial coin offerings (ICOs) for cryptocurrencies to investors.

https://www.smh.com.au/business/markets/floyd-mayweather-dj-khaled-hit-with-heavy-fines-in-cryptocurrency-crackdown-20181130-p50jdt.html