> According to LinkedIn the average tenure of employees is a little over a year (likely to hit the vesting cliff and bounce).

I think this is usually the case for fast growing companies that typically double employees every year, because:

1/2 people avg. 1/2 year tenure

1/4 people avg. 3/2 year tenure

1/8 people avg. 5/2 year tenure

etc. Which approaches something around ~1 year tenure. You'll notice the same 1.1 year tenure at Stripe, Affirm, etc.