It seems like most “slaves” in the galaxy have implants that slave-owners can detonate if they try to escape. Anakin and Shmi mention having them in TPM
We really see slavery only once in the saga, which is in TPM, and there, slaves have bombs in them. Concluding that most slaves all over the galaxy also have bombs in them seems like a bit of a stretch. Especially since TFA takes place 60 years after TPM.