I had a theory today regarding the creation of the Drones and would like to hear your feedback.
My belief is that the Drones were created by Destiny Descendants at some point in the previous 2000 years (more than likely in the last 200).
The design of them reminded me a lot of both the replicators and Asgard tech. Not close enough that they were built from the same technology, but similar enough that somebody could have designed them based off “legends” past down by their ancestors.
Eli also found them far too easy to reprogram for my liking. Now this may be because he is a genius, but even a genius would have a hard time learning a new programming language, in a completely foreign language and doing some decent amount of reprogramming in it. Shown numerous times with Carter in SG1 that could not magically reprogram alien tech until she learned more about it; once she learned a bit about it she could work with it fairly well. This suggests to me that Eli at the least found the structure of the programming language familiar to pick up on key concepts or is a genius beyond even Carter.
I could not find any screen caps to compare the written languages, but this may have been written in some cypher to make it harder for other Descendants to reprogram. They may have created the cypher code as 1 colony was at war with another or some other reason.
I believe they made the drones due to what they perceived as a large threat. This may have been another colony of Descendants/Civil War or even a military threat from the Ursini.
When faced with this threat they were suffering defeat after defeat until one of their scientists remembered the old stories that were learned of self-sustaining machines that could adapt to threats and almost wiped out their ancestors’ home galaxy. The scientist headed a secret mission on one of the colonies to create and launch the drones.
At some point they lost control of these devices until Destiny once again appeared.