"Spam-kun" on Heyuri traditionally refers to generic botspam (mainly on Strange World) and the notorious "posts CP on every imageboard at once" guy

This "six digits" guy is believed to be the same user who was dubbed "crazy-kun" on Strange World for repeatedly flooding the board with hundreds of nonsensical posts (saying things like "well I guess the camels know it after all don't you?") and also posted a ton of surreal doodles on Oekaki (such as this thread https://img.heyuri.net/o/potiboard.php?res=1234 )