Something that is a cross between a coconut crab, hermit crab, and a particularly angry car with armor plating would ruin your day.
Yeah. We didn't (we won't) even know they were there until after we'd lost quite a few modified spiderbots.
While they, of course, were ramping up their technology with the scavenged material. If we had known about them in advance, they wouldn't have been able to reach near-parity in space armaments.
Up until they got our technology, they weren't able to take advantage of Venus' mineral wealth.
With our unwitting assistance, they jumped several centuries of development time in just a few Venusian days. (But a day on Venus is longer than its year.)