The hairy worm and the flying beetle are the same insect, different stages of life.
They are the cleanup crew- probably cleaning up dead crickets more than poo.
It sort of cracks me up to know someone out there is setting them free (it is sort of similar to setting houseflies free). It's funny but nice to know there is some good in the world.
I feed mine out to my lizards which eat both the hairy worms and the beetles and they've never given my lizards any problems after a dozen or more years of doing this and the lizards seem to enjoy them.