For anybody morbidly interested in this kind of stuff, here's a fascinating case study. The token is ostensibly ERC20 compliant, but the transfer function is hardcoded to prevent anybody but the sender from selling on the Uniswap liquidity pool.

Muppets come in and buy the token on Uniswap. But they can't go back and sell it. Essentially all the Ethereum in the liquidity pool becomes the personal piggy bank of the scammer. There's nothing Uniswap can even do to prevent this type of scam, because the malicious code is in the token tracker contract, not Uniswap itself.

https://www.reddit.com/r/UniSwap/comments/jew0id/1000_reward...

But you need some liquidity? I dont think it is that easy. Never used uniswap or invested in ICOs but to me seems that the golden days of ICO scams are gone. People have either lost their money or learned the lesson.

We've now moved on from people naively buying into interesting projects and getting scammed.

Now, people willingly buy into pump & dump schemes, hoping to not be the ones left holding the bags. Just go to r/cryptomoonshots or /biz/ where a new coin is shilled practically every hour and everyone just hopes to ride the pump and dump it on the next round of gullible buyers.

There was a massive wave of food-themed DeFi tokens recently with multiple exit scams.