If he says no, push the topic again until he gives in. Encourage him to think about what happens if it gets taken down. But don't jump to, "Tell me about how you're going to stop it!"

Make sure you're prepared for his inevitable tantrum.

4. If a person publicly posts about the dangers of cryptocurrency, call him out. If you see his comments, like this one, you might want to ask him what he's doing to protect his family.

Ask him what he's done to take preventative measures and tell him to reach out to you if he's considering his current options.

6. Point out the power of the blockchain technology behind cryptocurrency. When your friend goes down the rabbit hole, try to show him the positive and important implications.

For example, if he says bitcoin blockchain, try to point out that all of the world's information is stored in the blockchain database, and so when he's ready to explore it further, he can.

7. If all else fails, point out how bitcoin holders are now billionaires.