I love me a bbbj cause to be honest, a cbj kinda sucks lls. What safety precautions, if any, do providers who provide bbbj and especially cim, take to lower the risk of an std?

Not a medical professional, but ...

Relavitve to PiV, anal, rimming, etc. the risk from oral sex is lower but not zero.

My understanding is that the only real protection for HER is a condom regardless of microbe, especially for CIM.

If you are worried about YOUR risk from BBBJ, it is mostly gonorrhea. It can live in the back of the provider's throat and can be transmitted with or without CIM.