I was doing the same thing, re-listening to try and get things right. But since you're offering...
How widespread were SAIROC AGIs, outside of Mitre?
His baseline consciousness is available everywhere, so it depends on the political orientation of the habitat. They are forks, which are illegal within Planetary Consortium territory for anything longer than 4 minutes. But they're also AGI, which can be considered non-citizens or full-blown WMD's, depending on the habitat's individual laws. Within these more conservative territories, SAIROC's are only rezzed in simulspace for the purposes of education and experimentation by programmers and psychosurgeons. Even that isn't allowed for the most part though since Ord Brown put a delete order out on all SAIROC forks.
More liberal/anarchist habitats don't deprive SAIROC's their rights, but since they can then use up resources at will, their numbers are limited according to space and logistics. Basically, if more workers with a specialized skill set are needed on short notice, an open-source SAIROC gets downloaded and modded out with skill sets. It is faster than re-educating someone, holding a recruitment search via mesh, or designing AGI from scratch. However, once the job is done, these anarchist's are not heartless enough to disembody the new consciousness. At this point, the SAIROC becomes part of the community and is presented with further psychosurgical options to further individualize their consciousness. The longer the SAIROC is rezzed, the more individualized it becomes. The only constant among veteran SAIROC's is a generalized optimism, willingness to help, and the faux-clumsiness of the befuddlement algorithm.
This recruitment method is why Mitre had so many SAIROC's. They regularly engaged in highly various, specialized research in a habitat type that required extra maintenance care, but operating as an illegal anarchist broadcast base in the LLA's backyard doesn't motivate a lot of brinkers, argonauts, or anarchists to move there. Thus, they rez more SAIROC's than average to take care of odd jobs around the base, which then earns each one a morph and citizenship amongst the habitat.
...Or at least that is how I imagine it. Change what you like. Long story short, I imagine every anarchist-leaning habitat has at least a couple of modded-out SAIROC's running around, either in the mesh or sleeved in a synth of some sort. Other than that, it's pretty uncommon to see them sleeved in the major polities.