21 million. No more, many fewer. "It might make sense just to get some in case it catches on." Fiat is fucks you money meant to make you poor. I advocate for Swan because they are one of the few bitcoin-only places to buy, they take a lot of time on Clubhouse to help educate people, and their automated DCA recurring buy is a good way to ride out any volatility while you strengthen your resolve. HODL on comrades, don't trade or let anyone take your bitcoins.