It happens almost everyday, especially in bsc network token due to the low cost of token creation and more faster transaction. The scammers working in a very simple way; create shit token, promoting ico, do some bounties to raise awareness, add some liquidity in an AMM platform, doing an AMA in random telegram groups, showing a certified audit partner. -> collect money from ico -> pull the liquidity and gone.
Most of them are kind of farming or swap project with anonymous team.