The rule is only concerning official factions and still has room for secondary IDs (for example, Miner ID for a small Scrap bonus compared to the 0.25 for invalid setup) - it's generally just a guideline for other factions. I don't personally see the need to use Junker ID when you can just use RP to differentiate yourselves from IMG|, instead of semi-ooRP means.
The base and different operation zone is a good step for that.
