Indeed. I worked on a team which was "given" a couple of contractors to help us "catch up" to where management thought we should be. They were both useless. Between finding something they could do without damaging stuff, fixing what thay had damaged anyway, trying to maintain the morale of the rest of the team and explaining to management why we would be better off without them... I was easily more than 10x more productive than they were. But the team was in a hellish mess.

I think true -1x devs are also rare like 10x devs. To be -1x everything you "contribute" has to be a net negative. They are out there, but I think they're also rare.

Those people are called testers.