Yeah, I got paid to do gradschool. Not much cuz I didn’t shop around and just stayed where I did undergrad, but yeah, once you’re doing research, they should be paying you.
I don’t know, there are lots of PhD programs in the U.S. where you’re a research assistant, which basically means your tuition is free and you’re paid a stipend for the research. In my experience, I’ve only met US PhD students who were fully funded.
I think people think that having to TA means they’re not being funded or something like that. If you’re getting into a program that doesn’t fully fund you, then that program doesn’t want you or it’s not a good research program. All reputable PhD programs fully fund across disciplines.