With his current strength, Aeon was not worried about his monster subordinates. If he sensed anything wrong, he could kill them easily.
Also, Aeon knew the reason why these monsters wanted to follow him and it was not to get captured or killed by others.
As the low-level monsters on the First Floor, they have many predators.
Starting from the Life Blood Cultivators, they have to protect themselves from the other monster races and sometimes, from their own kind.
These monsters knew that the Humans in the Celestial World Tree were special and could receive things from the Celestial World Tree by killing monsters.
Hence, by following Aeon, they would avoid some of the dangers and if they are lucky, they might be bestowed some cultivation resources from their master.