Don't see anything about them eating roots, not living at least. Definitely sounds like they are beneficial to me. I have thousands crawling around pots, soil, hell my whole growroom. Never had a problem with them eating anything on my plants.
I'm not saying you're lying. I'm just saying that I don't see any info on what you're saying. I'm not worried anyways. I have so much going on in my soil that I don't believe they're detrimental to my grow, but I'm not saying others haven't had a different experience with them.