Most girls who say they only do safe use it as a way to not have to suck some disgusting guy's dick bareback. If they're fine with the guy there's no condom (at least for the BJ). Sometime they don't offer BBBJ until you're established as a regular, again to avoid having to suck every guy's dick bareback.
I've had plenty of girls who advertised as "safe" who didn't miss a beat before going for the BBBJ.
If you're convincing yourself a girl is clean bc she only offers "safe" services, you're delusional. She has her preferred customers and the condom comes off for them. It's a cutthroat market out there and offering only safe services limits your income.