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.
I agree with you, and the part that always sinks this within SW is that all he did was put together a very commonly used droid from spare parts. Protocol droids are all over the place!
Is it impressive to put together a Honda Civic from spare parts in your spare time? Yes. But it’s also just a matter of collecting the right parts and having the time to assemble them right. No one is inventing anything new, and it always seemed like that was what EP1 was trying to sort of say.