If you were to define it that narrowly any company that doesn't do its own accounting is not longer a "single person company". At that point I don't think you'd

If you were to define it that narrowly any company that doesn't do its own accounting is not longer a "single person company". At that point I don't think you'd be left with many companies that make much revenue, so even though the code is open source that still counts as a single person company imo.