I think it might be, there’s no way Anakin would be able to buy proprietary hardware or software. So either he stole it, which his mother probably would not have allowed. Or he was able to scrap all the parts together because there is a template for humanoid protocol droids that we have also seen round Star Wars. And then the software itself either Anakin programed entirely himself, (which I know he’s very smart, but even that seems a stretch) or he forked it. So it would make more sense that there was an open source catalog of protocol droid software. It also would make more sense due to the fact that a lot of people have droids, but they are not all created equal. I would think many of the droids on Coruscant were proprietary, while many of the droids in the outer rim are open source.
So in A New Hope R2 trudges off looking for Obiwan at the beginning of the movie. They are both captured by jawas and are going to be sold for parts. Owen needs a droid that can communicate with his moisture evaporators and diagnose issues. R2 is useless in this capacity. He buys C-3PO. C-3PO tells him to buy R2. The entire series would have been over right there as R2s memory would have been wiped by anyone without a translator there. 10 minute short film about how the Almighty Empire who does no wrong thwarted a terrorist organization.
Oh and Empire Stikes Back famous hyperdrive issues are diagnosed by “plugging C3PO up to the hyperdrive” so he could download/diagnose and spit out any hardware repairs needed while performing any software changes needed himself.