I strongly disagree, it's not a loophole, it's literally one of the most used incorporation methods in Norway ("aksjeselskap", or "AS"): https://www.altinn.no/en/start-and-run-business/planning-sta...
This model isn't unique to Norway. Plenty of other countries offer similar incorporation methods.
But isn't that exactly how consultancies work though? The client enters into a contractual agreement with the consultancy, asking for specific consultants to help the client get certain tasks done. The consultants are "treated as employees" in the sense that they often have to physically work with the client, on the client's projects, during the client's schedules, having lunch in the client's canteen, working with the client's team, reporting to the client directly, using the client's tools and processes, creating IP for the client, etc.
That their company receives income from multiple clients, and the engagement is for limited duration is evidence for them being contractors.
The IRS and local governments make the final determination.
https://www.everee.com/blog/irs-independent-contractor-test/
If there's a subjective test involved, where some things are left to interpretation and circumstantial evidence, my take here is that it would be wisest to work with a lawyer/accountant on setting up the correct structure for each engagement.
It's also good to remember that this is the IRS, and that other jurisdictions may have entirely different practices here.
The vast majority of single person corporations are pass through entities. There’s no income tax withholding , no salary, no corporate tax etc…
However even in the very rare case where you setup a non pass through entity, if your company only has one source of income and that is you the owner operating as a de facto employee of another corporation, in most jurisdictions that is false self employment.
What you’re describing is an often attempted loophole, and there’s plenty of precedent that it doesn’t hold up.