Everyone is wondering what it will take for mass crypto adoption. I think the Brave Browser gives us the answer. It reportedly now has 10 million monthly active users. This means that 8, 9, or 10 million people are getting cryptocurrency in their wallets each month. It is a sensational distribution model.
This is key. The masses are not going to "buy" cryptocurrency. They need to receive it as rewards. When you think about it, people do not "buy" fiat. Instead, they get it as payment.
Mass adoption will come when hundreds of millions of people are receiving cryptocurrency as rewards for activities undertaken. I do not believe it will come from one source but, rather, many different ones.