Why label your company as "remote-first" if you only hire from the United States?

I don't think those are mutually exclusive to be honest. You can have a remote-first company and that could mean there's no offices and anyone works from remotely.

That being said, job postings should include these facts. I've seen quite a lot of postings labeling the position "Remote (US)" or "Remote (US, EU)" or even just writing the "work time" timezones in the description and that's a good way to be upfront about stuff like this.

Thanks for this. I understand that hiring can be complex for certain areas. Most companies only mention equal employment details, they often don't explain the reasons behind the geographic limits.

It would be beneficial if they were to provide a comprehensive explanation of job requirements in their listings/careers page so applicants from all over the world could get a clear picture of what's possible and decide if it's worth applying.

Yeah, I agree completely.

This is the correct answer. Most companies, especially smaller ones, don’t have the resources to handle dealing with an entire country’s set of labor and finance laws for possibly a single person.