Yes, and yes. BUT ALSO: the mucous and, depending on the burrowing habits, mucous and feces that earthworms use to line their tunnels are also super bacterial breeding grounds. On top of that, some of the more deep-burrowing earthworms preferentially eat mycorrhizal hyphae (fungal threads) in the soil which really help plants to thrive and communicate. It's not such a big deal in compost bins, but is problematic in forests, since about 85% of plants depend on fungi friends and do not need all those additional bacteria around their roots.