I don't want to imagine the ratio of "lots of studies" to "actually found helpful", I'm sure it's a super depressing value.There are a lot of studies going on for it, so there must be some reason to believe it could possibly be helpful.
It's certainly possible, as in "anything is possible", but I wouldn't be counting on this if I was just some random person. If it's someone participating in a study, that's different. As they're being more closely monitored and if it doesn't work out they'll get the additional care.
So, anyone who got some pills from "a guy", "some friend", or "the store down the road", while they're not all the same, they are all taking a gamble.
Now, if someone has COVID and a parasitic worm infestation, they should totally see a doctor about getting some. It'll help tremendously with the parasitic worms which should let you immune system focus on COVID better. While not a huge issue in the US, it is an issue in many places.