This has actually always been the case (Dan Luu's article from 2015 comes to mind), but, previously, it required doing a bit of actual math, and doing a bit of reading:

https://news.ycombinator.com/item?id=10758278 (2015 danluu.com/startup-tradeoffs)

This Windsurf employee #2 revelation of the 99% loss in value for employee stock, is simply a confirmation of an existing practice, just more visible and easier to reason about.