Also lets not forget how weak many of the creators were.
Gero and 19 are possibly at the same level as Frieza, even then he was never exposed to the capabilities of stronger fighters the androids never would have been made that strong. it would have been considered impossible.
Raichi was not powerful on his own
Myuu also not powerful on his own
Babidi also VERY weak on his own.
Frieza and his empire would have wiped them out at the first sign of threat.
Now it can be implied that Bills could have allowed for this since Frieza carried on destruction for him. Bills also could have taken out the stronger enemies to keep his followers (frieza and co) in power.