In my opinion no, BGT isn't worth it. For the reasons people have discussed here already, plus the fact that if you want to make anything involving rotation, you've gotta recode so much of what's provided that BGT doesn't save huge amounts of time. There are classes out there for that now, but I've never really understood how the math behind the one I looked at managed to work, so made my own. Then I realized I'd have to either make an online game or somehow make an unrotatable AI work in a game with rotation, and gave up because I'm not gonna pretend to be smart enough to try and make my own, and at the time I couldn't find a way to work around that. I've been taking a computer science program in university for the past while, so I might come back to game programming eventually, but unless BGT gets updated, I'm not going to be using it. And I don't think the likelihood of that is the highest.
When it comes to DRM, the only kind that really bothers me a lot is that placed on media. If I buy a movie or TV show, I refused to be forced to watch on a specific platform. Thankfully this isn't the case with music anymore, but I'd feel the same way if it was.
That being said I do have spotify, which is worse, really.
You, me, everyone! I'm not discriminating here.