Can anyone explain what is he doing on memo.sv or bsv netwo…

Can anyone explain what is he doing on memo.sv or bsv network? More than 13,000 trash tx. All are about "Brute force attacker".

Does he bring network attack actions onchain?

https://whatsonchain.com/address/1KahUFVBGfS4piz8Z5bHnE1mdSueDicbfX