Massive risk implies massive reward: what do they know that we don't? Meta-alloys are freely available, and have been for a long time, so it can't just be that.
Also - if the Feds are there, then you can damn well bet on Imps and Alliance turning up at other sites.
It'll all be fine until one of them mysteriously gets vapourised, with the victim blaming one of the others factions for it. Cue war. Potentially.
Tensions rise, conflict zones appear, but...
but... when more Capships start mysteriously getting blown out the sky, somebody will witness one, and realise that it wasn't another ship - but the innocent-looking barnacle beneath it, emitting some energy beam or weapon or some sort.
Which would then also explain why these life forms weren't protected (till landgrabbers came along with their skimmers and goliaths) - they didn't need to be: they can protect themselves