They have doubt for sure to lose their money that they have right now. We don't know the real reason and for sure of that they have different opinion , thoughts and doubt why they did not invest to cryptocurrency. But once they see the real potential of crypto maybe they will change their mind and they will invest no.
These people believe the bad news about the cryptocurrencies. They think that all the guys, who invest their money in the cryptos (Bitcoin or the tokens), finally become losers. Thus, they stay away from trading.