A'right.
I know and understands if he's talking about those smart contracts scam because they do really exists. This scam is quite new and has a lot of victims already.
~
I'm not quite sure if this kind of scam is quite new, the code that required to execute the scam is likely inherently possible on the smart contract since its early age. I tried to look around for this kind of scam, it dated back to October 2020[1], and the Squid Game issues are happening around the late months of 2021. So non-sellable smart contract has been exists for some time.
It's true that some people easily fall into this kind of scam since the characteristic is only observable via the smart contract code. But on the first hand, people really should think twice when they gamble with brand new tokens, I mean it's preventable.
[1]
https://www.reddit.com/r/UniSwap/comments/jkxd6z/nonsellable_tokens_on_uniswap_how_to_recognize/I mean that it's quite new that many are voicing this out. But yeah, it had happened in the past but only a few have spoken about this style.
Nonetheless, this scam is still around and still tries to get as many victims as it can. It can be avoided if someone has knowledge and is aware of it.
But sadly, not everyone is.