Having free oxygen in the atmosphere (I don’t know, 500 M-year?) would already had put us as target for oxygen breathing advanced civilizations in a long enough

Having free oxygen in the atmosphere (I don’t know, 500 M-year?) would already had put us as target for oxygen breathing advanced civilizations in a long enough radius. If they could be a realistic threat capable of wiping us, they should had been here even before mankind evolved. Maybe the great filter is the great promotion, acquiring a knowledge/technology powerful enough to not need to go to other solar systems or expand a lot. But as we are not yet there, we expect invasion fleets.