Linchpin used in a sentence

Linchpin in a sentence as a noun

The linchpin to the whole thing is the easy VC money.

That's the key piece in #4, and the linchpin for the whole experience.

She's the linchpin of our family in many ways.

It's the very linchpin of what makes a good software engineer.

Mortgage fraud was another linchpin during the financial crisis.

"It's been a linchpin to the ultra-conservative and libertarian arguments for "free market"-izing education in the US.

I agree that action against individual companies can be effective, but there is an extreme focus on GoDaddy like they're the linchpin of this whole thing, some kind of mob boss when they're just another company who has lent their weight to this legislation.

Wouldn't the fact that Apple is able to remove the scrollbars in several situations imply that they aren't a 'linchpin' of UI design?I rather like that I get a little extra real-estate, but some times I would like a visual indicator that there is more to a page off-screen.

I find it sort of ironic, in a deeply tragic way, that a totalitarian state such as China finds itself incapable of enacting the sort of sweeping environmental regulations which were the linchpin for bringing about vastly cleaner air, water, and soil in the liberal democracies during the mid-20th century.