Think every core IT infra of most of the developed world countries, most of the ebanking and core messaging infra of your large banks and insurance companies, plus billions per year in consulting services revenue.
Again, HN users are in a bubble, and HN users think that they’re very trendy.
HN users are trendy. If you didn't grow up in the 1990s or before though you may not remember just how picked on this type of crowd was. Now while we are never exactly the "in" crowd, we are respected, being a "nerd" or "geek" is now an acceptable thing. We have come a long way and that is enough trendy enough for us.
https://en.wikipedia.org/wiki/List_of_mergers_and_acquisitio...
https://www.redhat.com/en/about/press-releases/ibm-closes-la...
https://finance.yahoo.com/news/ibm-releases-first-quarter-re...
Additionally, you don't need the full purchase price in cash to buy the company. You can do leveraged buyouts, etc.
Hopefully someone at HashiCorp: "Hell no, cash please"
If you're a shipyard, an oil company, a bank, an automaker, etc. you still need software to manage things like inventory, employees, logistics, and similar, and you have zero expertise to do it in-house. They also have zero expertise to find a qualified vendor.
IBM is a safe bet.
That's a huge market.
I think they can find a few billions lying around, without having to turn the sofa cushions.