Ever wonder why TOAA never interfered in marvel, or why he was never even shown?
Because he transformed himself into the Seven Infinity Gems, Ego, Reality, Soul, Power, Mind, Space and Time, therefore he didn’t exist anymore.
The Beyonder was in fact Beyond TOAA’s multi-verse, he was the representation of non-existence, therefore there is nothing that TOAA can do to be rid of him except to build a barrier between the Multi-verse and the beyond realm, due to the fact that you can’t erase nothing because it is already nothing in the first place.
But because TOAA is something, he in fact can be erased, and become one with the Beyond Realm and the Beyonder, this was why he turned himself into the Infinity Gems.
BUFFER THAN ZEUS/LIGHTER THAN HERMES/STRONGER THAN SUPERMAN
And that’s why Goku took him 'em out