Mark is a known bitcoin/crypto investor. In fact, since Mark Cuban owns Dallas Mavericks, there was this news years ago about the team will start to accept payments in crypto for tickets related to Dallas, well this was in 2018. (https://cointelegraph.com/news/nbas-dallas-mavericks-will-accept-bitcoin-for-tickets-mark-cuban-promises) I don't know if that had came into reality since 5 years has passed but this has came from Mark himself.