California has banned state-funded travel to 17 states over LGBTQ laws
sacbee.com
sacbee.com
Oh...wait.
https://constitutioncenter.org/interactive-constitution/inte...
So it seems to be relevant to the federal government trying to favor one state over another in taxation. Someone could sue over this and establish new precedent on this subject, but it doesn't seem relevant right now.
Your link discusses this near the bottom
https://en.wikipedia.org/wiki/Privileges_and_Immunities_Clau...
California is pretending they're somehow more equal than other states. Kind a defeats the purpose of being a "United" nation if other states can impose policies on other states because they think they're offensive and not as enlightened as themselves.
How does it work if I have legit business there?
I believe Mexico sent rescue experts to FL given their expertise in rescuing from collapsed buildings.
It also says that you can't be required by your job to travel to those states. So if they declare it an exception, they'll pay for it. If they don't declare it an exception, you can't be required to go. Under no circumstances could you be forced to pay for it yourself.
Private funded travel is fine.
Sounds like a non-story to me.
You might try being specific next time. If you're at the point of clarifying you mean regressive when you say progressive, you can't convince me the words mean anything.