Earlier quoted context omitted.
Except, in the case of big tech, Internships pay six figures . There are other perks of being a grad student than just the pay though... : sure, the internships aren’t typically a year long, but if you do the math for what’s paid for their duration it’s an incredible amount if it did last a year.
Then what's stopping unpaid interns to take big tech internship?
In some places if you have an unpaid tech internship, everything you do has to be an artificial training exercise for the sole benefit of the students.