I do think it's worth examining any data as related to possible affects on fish health. but I'm no biologist & researching the various pathogens listed is a task in itself.....
Also, from the list of pathogens, parasites, etc. you can find those that can infect both fish and mammals, for example, cestodes (tapeworms). If someone doubts whether any of the worm carried parasites mentioned in the article applies to fish, try looking up capillaria just for starters. In fact, here's an article on it.
I'm just trying to contribute some information that in my opinion is relevant, that's all. ................
........, in effect I've said here's something about earthworms not everyone knows and at least some might want to know. ...........
I'm less inclined to use worms from outdoors. I'm not sure if I really "get it" about things found in bait worms.