Well, I never did condone the hamster balls, they have had serious problems.
Pet rodents don't need to go outside if they have plenty of enrichment indoors.
I only had one pet rodent, a mouse, I could let free roam, even outdoors without running off or trying to escape.
He was hand raised though and I was his mama, friend, and companion and always came when called, like inseparable. None of my hamsters got beyond a little roaming my room and then with close supervision. First thing I did was train them to come to me with a treat sound like a smootch sound or bell. I rattle my rattys treat box, they come running, just didn't trust them outside.