There aren't unlimited numbers of these. Not sure if folks know it, but every rebel city has what we call a faction owner, that has to be a rebel faction (you have to put a captain in that city, or a general rather in EB to keep them immobile, who has an appropriate name for his faction). Some factions wind up with a rebel sub faction that is vast. The Aedui and Arverni rebels fill up a lot of provinces from the English Channel to the Bosphoros almost. And there are a lot of KH rebels in greek cities across the map. But some don't have any at all, like Pontos. There aren't any Pontic rebel provinces at the start of the game I believe. Very few Epeirote ones too if any. So Pergamon would have a KH rebel sub faction set of banners. The Ammonion would have a Ptolemaic set, the Numidian provinces a set of Carthaginian ones, etc.
For some we have clearly tried to make a rebel "faction" out of them - like the Carthaginian rebel ones are really just inland African ones so we made them look Numidian. The Makedonian ones we made "royal pretenders", so they have an alternate royal makedonian set of standards. That goes for Baktria too, their rebel provinces are mostly in India, so we gave them an elephant and a royal Baktrian insignia to serve as a sort of "royal pretender" also. For the Seleukids, where rebels pop up for them, they have old Persian banners, so that you are fighting armies that look like uprisings that are attempting to restore the old rule. The Ptolemaic ones look like a traditional Egyptian eye of Ra, so it looks like a native uprising when you fight against them. Saka and Sarmatian rebels just look like other Steppe factions' banners might. Roman rebels have the Italiote bull, that you sometimes see charging the wolf on coins. I believe Epeiros' subfaction just has alternate royal banners too to represent a royal pretender. Parthian rebels look like another eastern horse faction set. Hayasdan rebels have another set of traditional Armenian symbols, so it seems appropriate when you are conquering those other armenian and iberian territories in the region.
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