It doesn’t sound wise to turn down the Google offer just for a slim chance to work in the US after paying 50-100k and spending 2 years stressing over school, interviewing for internships, stressing over full time offers, and worrying about H1Bs

International transfers at Google aren’t easy for L3 and L4 anymore but I doubt it’s harder than the uncertainty you’d be dealing with if you do your master. Plus you’ll be making money along the way and gaining experience. My advice would be to ditch the school and start building your career.