Exist scammers in the crypto sphere do exist. We saw a number of them form in 2017. We should warn people to be wary about them and not to touch their coins.
However when you hear people accusing devs of being potential exist scammers after many years of development then it's quite unfair. If the devs haven't sold their coins after so long then maybe they are not exit scammers. They could have sold their coins for BTC years ago (especially when prices were high) but decided to hold after multiple bubbles.