[Spanish from Spain]
"creepy" could be translated as
"inquietante", "grimoso", "asqueroso", "repulsivo"
Best fit could be "asquerosos", because is offensive and colloquial.
"motherfucker" could be "putos", "hijos de puta", or "jodidos". I prefer not to use "putos/as" as an insult because I don't wanna support slutshamming.
"El enriquecimiento de más los jodidos asquerosos fascistas billonarios del mundo entero"