Exactly, this list of Ponzi Scheme red flags is from Investor.gov[1]. While certain aspects of the crypto ecosystem may fall under these red flags, most don't, or don't apply to the coins/blockchains themselves.
> Many Ponzi schemes share common characteristics. Look for these warning signs:
> High returns with little or no risk.
Some new shit coins and many NFT projects absolutely make these bullshit claims, but it's well, well known that there's risk by speculating in crypto at this point. We've all seen multiple 80% drops in bitcoin's price (or you can with a simple look at the 5-10 year chart). It's no secret. People speculate in it anyway for other reasons.
> Overly consistent returns. Investments tend to go up and down over time. Be skeptical about an investment that regularly generates positive returns regardless of overall market conditions.
Except for maybe stablecoins (which we found out this past year aren't exactly stable), no crypto coin can claim to have consistent returns.
> Unregistered investments. Ponzi schemes typically involve investments that are not registered with the SEC or with state regulators.
This part is true for many crypto coins, and the SEC is going after them now. Bitcoin itself seems to be immune to this by having no centralized component to it, which is unlike most other coins.
> Unlicensed sellers. Federal and state securities laws require investment professionals and firms to be licensed or registered.
Most exchanges are either licensed and registered if they operate in the US, hence their KYC measures.
> Secretive, complex strategies.
Yeah, some algorithmic stablecoins are like this (at least the complex part), and you've seen most of them collapse at this point. The rest are pretty simple coins for the most part, and many of them have completely open source code, so there's nothing secretive about it at all.
> Issues with paperwork. Account statement errors may be a sign that funds are not being invested as promised.
You can't really have an account statement error on the blockchain outside of a 51% attack (which is arguably not an error, just creating a new consensus), although some of the companies that have sprung up around it add obfuscation that can lead to possible account errors. Banks can have account errors as well, though.
> Difficulty receiving payments. Be suspicious if you don’t receive a payment or have difficulty cashing out.
This one can happen at exchanges, but the blockchains themselves still work and you can transfer with others directly, assuming you have taken your crypto off of exchanges ("Not your keys, not your crypto" as the saying goes).
[1]: https://www.investor.gov/protect-your-investments/fraud/type...