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> I can't tell if the people posting and endorsing it are naive or predatory.

If you believe the post, the author is giving this advice because it worked for them. There are a lot of people like that.

Technically, also true for a ponzi scheme. Anyone invested in crypto will increase the value of their holdings by getting others to buy in and exiting before they do.

Any good scam like that is going to contain both in significant numbers.

¿Por qué no los dos?

and only 10 months ago...