For our industry, it's effectively already required, right? Because of other jurisdictions that require it?
CA and a few other states have recently enacted this same law though so it'll become a lot harder to avoid posting the salary if you want good candidates.
It's not like they're trying to avoid a bad law.
1. Employ zero (0) people in the state of Colorado 2. Must have a "real" reason for restricting the geography i.e. the job is not remote.
I mostly used it as a way to get salary info up-front, even through a recruiter.