This reminds me of someone very close to me. Dude is a fan of ponzi and the painful thing is he never learns. He was a victim of MMM and MBA ponzi scam. Recently, during our discussion he told me about an investment opportunity, and he wanted to invest $1500. I tried convincing him not to invest, to buy bitcoin and hodl, that was when Bitcoin was 25k. Dude didn't listen, the last time I brought up the conversation, he couldn't say anything, I've a feeling he's been scammed again.
I also once reminded someone who went too deep into the ponzi business, but in the end was not listened to.
People with this disposition and too idolizing Ponzi schemes will never stop.
They will only look for other ponzi businesses when the business they are participating in now is scam and deceives many people.
They are only concerned with their own profits, not with the losses of people who are drawn into the business of ponzi, MLM etc.
Like the person you are talking about, he may be cheated again with a ponzi business, he will never stop despite the loss.
$1500 is a large amount, much more promising investment than relying solely on ponzi businesses etc.
As in Bitcoin crypto investment which is more certain and provides benefits for who buys and holds it.