I have a few people that do that, that's why blacklisting users and stopping spam is so difficult.

This user sends 6500 memo wallet spam at a time promoting his posts

or this guy that flagged me with 6 of his accounts when I flagged him for spamming and stealing images across multiple accounts.

https://steemitstage.com/spam/@themarkymark/the-frustration-and-difficulty-of-fighting-spam-on-steemit

Fun times!