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.
On the one hand I can understand your meaning there.
On the other, Threepio’s famous boast of “six-million forms of communication” kind of precludes having room for six-million physical modules anywhere in his chassis.
Enter: science-fantasy.
It would have to be a large number of languages per module, but the universe was written in a 20th century kind of way where hardware is single-purpose.
The actual answer is of course that Star Wars isn’t believable, but ignoring that…