That is only evidence that it's possible here. Elsewhere is an unwarranted extrapolation without any physical evidence.
No, it's not, given the size of the universe and time. We are learning more and more about proto-cells and such. You also wouldn't want to live when and where life first evolved on earth. There is reason to think life evolved on hydrothermal vents. There must be countless planets in the universe with those ... many many many trillions.
If life evolved here on hydrothermal vents, also, who is to say it couldn't under other conditions we wouldn't find hospitable.
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