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I thought the whole thing was He3 makes it viable.

Only if and when fusion reactors using He3 become possible, which for now is unpredictable.

Ok, I thought He3 was also useful for smartphone manufacture?

No, you're probably thinking of this: https://news.ycombinator.com/item?id=18340693 (He4 exposure temporarily messes up iPhones by glitching their MEMS clocks)