Exhausting into the attic

If the attic is like 20 feet long and 10 feet wide and like 4 feet high, with like 5 or more 7-8 inch wide passive air vents, could I just exhaust into like the middle of the attic without the worry of mold?
You'll eventually get mold if you exhaust into your attic and if you live in a cold place with cold weather than that mold will freeze and there'll be holes in your roof, but would it apply to someone who has an attic that isn't fully enclosed?

Plus I live in a 90+ degree place so I don't have to worry about freezing mold. But I still don't want mold in my attic.

Why dont you run the exhaust directly out one of the passive air vents?

Without knowing the ambient RH of the area you are living in and the RH and CFM of the exhaust air there is no way to answer the question.

If you live in a dry climate it will not be anywhere near as big a problem as if you live in a humid environment.