And it is not a 10B loss, because employees gain skills and there are learnings or other tech innovations that can be used in other projects
According to this SO blog, Google had an average tenure of 1.1 years:
https://stackoverflow.blog/2022/04/19/whats-the-average-tenu...
Obviously this written before the big tech layoffs kicked off, but it's quite alarming if true.
I believe you're going to see the lower average at places that have larger signing bonuses or other compensation that skews that way.