I have posted what are called Red Wigglers (Eisenia?) from my compost barrel here in Oregon. Probably E. fetida, though my knowledge of worm taxonomy ends somewhere before we get as precise as the family level (Lumbricidae, earthworms).
Compost piles and dung piles are homes to some interesting biodiversity including my favorite fly, the Golden Dung Fly. Attractive as flies go and with such interesting behavior. (Males hang around the dung pile. When a female shows up, all the males pile on around her and scuffle. Finally one male gets to ride the female out of the scrum as she walks over the pile laying eggs.)
I think @carnifex meant the specific observation OP talked about, you can’t key it out, as most of photos of worms that people post, my key book lists 20 Eisenia for the country, I wouldn’t id my observation of that genus to a species level from phone photos alone. That answers the OP question, there’re only so many observations of them because worms are not easy to id and mosy iNat users don’t go as far as you describe.