ok here's my 2 cents:
I was an unpaid intern for about 6 months when I started. While it is literally slave labor, I was compensated pretty heavily in education. Does it pay the bills? not at all but it did end up shaping me into the successful (relatively speaking) engineer I've become.
Reality is, getting into the commercial studio business is a young mans game. If you aren't willing or are unable to work for free or basically free, then it's not an industry for you. Even now I know of studios in town that pay runners 25-50 dollars a day. Don't like it? quit, cause there's 100 other kids who can and will work for that in order to learn. People will easily drop 20,000 on recording school, but then aren't willing to pay the same in labor to learn 10 times more.
Obviously there are people who straight up use and abuse people with this system, and that's not cool...but I genuinely feel it's a necessary evil. Know a limit to how long you are willing to do it versus how much you learn. discuss it with your employer, and figure out what the reality is of getting a paid position and how long it'll take.
If you eliminate the ability for interning for free or below minimum wage, you will create an industry where studios have tiny staffs of really talented , specialized people, with no way to learn from them unless you book your own sessions.
I'm biased. I did it, I worked my ass off doing terrible, almost humiliating stuff, but I saw the end game and remained focused. I'm sitting at about 10 years now of doing nothing but working audio since I left high school. That 6 months taught me fundamentals of studio etiquette, and how to succeed. I have an assistant right now that our studio is trying out. He gets 25 dollars everytime he works with me...to learn. He lasts past my tutoring/analysis , he gets assisting gigs for 100, then a little long when he can edit it'll be 150. Will he make it? maybe, maybe not, but there's no way he'll get any better without doing it.
this of course all applies to commercial studios...home studio/self taught is a whole other world of things.