Yeah, no PhDs in the US don't make 100K year. The stipend for an MIT PhD is about 50K a year half of what you're saying. Citing my wife who just finished their phd. MIT also makes it so everyone is paid the same as PhDs even if they bring in their own money like my wife did.

You definitely could make 70K if you worked somewhere and also won a research fellowship, but that is the exception, not the rule. I think it's amazing how much science the US produces, considering how low the pay is. Maybe I'm spoiled in CS, but it's crazy how little people in science get paid, especially considering I think their work is often fundamentally more challenging. Granted is also much more risky and hard to monetize