Exactly. I wish more people had this view of interns. Unpaid ones, at the very least. I worked with a few, and my colleagues would often throw spreadsheets at them and have them do meaningless cleanup work that no one would ever look at. Whenever it was my turn to ‘find work’ for the interns, I would just have them fully shadow me, and do the work I was doing, as I was doing it. Essentially duplicating the work, but with my products being the ones held to final submissions standards. They had some great ideas, which I incorporated into the final versions, and they could see what the role was actually like by doing the work without worrying about messing anything up or bearing any actual responsibility. Interns are supposed to benefit from having the internship. The employer, by accepting the responsibility of having interns, shouldn’t expect to get anything out of it other than the satisfaction of helping someone gain experience. Maybe a future employee, if you treat them well.
Your anger is entirely justified, and I share it. This whole licensing issue is a massive problem and shows how little publishers care about their customers. That said, this has always been the case, they’ve just covered their legal bases by updating their TOS.
But to answer your question, there’s no reason to keep using steam, other than it’s one of the easiest ways to legally game. It’s totally your preference if you want to keep supporting their business. There are lots of ways to illegally game, or pay way more for some DRM-free games that you can actually own, but then you’ll be extremely limited in your selection. I’ve invested so much time and money in my steam library, that I’m basically locked in (they count on this, of course). Sure I own a bunch of games on GOG, but they represent a tiny fraction of my overall library.
This is a totally unsatisfying answer, but your only actual recourse, if you want to keep using steam, is to reach out to them and express your displeasure at their updated TOS and its implications. But it’s an industry-wide problem, so I think we’re out of luck until Congress gets involved and changes how digital ownership works.