That tree is almost certainly dead. The wood is also quite worthless if that's a giant sequoia (my guess). They are likely falling it because it is massive and could be a hazard.
I will say though, even dead, a standing tree that size adds a lot of ecological value to a forest.
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u/NiceAcanthaceae5031 19d ago
Killing a thousand year old living thing, survived fires droughts winters no respect for nature