Crypto: Who Should Never Ever Touch It?

Crypto is great, everybody loves crypto (well, kinda), and tons of people all over the world want their piece of the cake: that's why everyone is talking about it and subreddits like this one have got a lot of users subscribing.

Some people dream of becoming rich, someone just wants some extra income, some others like being able to spend quickly and freely, etc. etc.

The more people know about it, the more want to use, hodl, invest.

But do you really think everybody should enter this world?

Aside from the obvious exceptions (i.e. newborns, mentally incompetent people, people with literally $0 to their names, etc. etc.) are there people in whose crypto becomes... kryptonite?

Based on your personal experience, who should never ever think about crypto, let alone use it? And what specific kind of incident has made you realize it?

I am looking for some cautionary tale... and possibly a few horror stories.

Let's pull no punches!