This is a form of brigading that isn't ok here, so please don't do it. It isn't required to post a salary. There are many reasons why a job ad might not, and we don't want to exclude anyone.
All: Please don't do systematic voting on HN, including in hiring threads. It's not in the spirit of the site, and if we notice people doing it, we take away their voting privilege.
> When this post series first started almost every company did so
The opposite is true: it's always been rare. I looked through the first three months (starting at https://news.ycombinator.com/item?id=2396027) and didn't see one. Anyone can page back through https://news.ycombinator.com/submitted?id=whoishiring to look for themselves.