I think you mean ‘faint’ of heart.
Feint, being a deceptive or pretended blow, thrust or other movement in fencing or in boxing.
I agree with you, crypto currencies are high risk, but high reward tools. Other than that, I’m not yet ready to throw money at it. I keep hearing about people being cheated or stolen from by nameless, faceless bad guys, who never do get caught or prosecuted. I expect more safety measures to eventually be put into place for crypto transactions, if they remain popular.
I didn’t say “feint.” I was quoting the person I was responding to. I’m not the spelling police, but evidently you are.