What is this scam?

Hey, over the past few weeks I keep on getting DMs on Twitter which read something like this:

"Hey, I've got a wallet with 5k USDT in it but I'm too poor to withdraw, could you withdraw for me we will split in half here is my seed phrase – bla bla bla"

What is this scam? What are they trying to achieve? will something bad happen if I import the wallet from the seed phrase they are giving? I obv haven't tried that.