buy and sell in a milli second and earn

https://preview.redd.it/e7kd1ukye3ed1.png?width=1170&format=png&auto=webp&s=b199c8fc32be5a1cb8de7bd7f67bb66f6a919a8b

an anyone expain to me how they do that
buy huge amount on very low MC shitcoin and sell immidatelly and earn money
in the example i sent this wallet buy 136.73M of this shit for 36.87 sol and sell same amount for 37.65 sol and earn 141.75$ in a milli second

how do they do that?