It’s not, but you need over twice the current to supply the same power, and since many safety measures and physical constraints limit the current, it effectively means the power limit is more strict.

This is assuming the same cables and breakers etc being used for both voltage ratings. I know there are specific wiring and connection systems for high amperage stuff in 110v places (probably for some 240v places too, but I’m in a place with notoriously bad electrical everything, fuck if I know)