IBM took away the ability of CentOS to be a free and trivial to swap-in alternative to the paid product RedHat Enterprise. That RedHat was already in financial trouble due to self-cannibalizing their own paid product is irrelevant; emotionally, “IBM” – not “RedHat” – made the decision to stop charging $0 for their custom enterprise patchsets and release trains, and so IBM will always be the focus of community ire about RedHat’s acquisition.
I expect, like RedHat, that the Hashicorp acquisition will result in a lot of startups that do not need enterprise-grade products shifting away from “anything Hashicorp offers that needs to charge money for Hashicorp to stay revenue-positive” and towards “any and all free alternatives that lower the opex of a business”, along with derogatory comments about IBM predictably assigning a non-$0 price for Hashicorp’s future work output.
* Red Hat wasn't ever "in financial trouble" -- their revenue line was up-and-to-the-right for a ridiculous number of consecutive quarters. Even when they missed overall earnings estimates, it was rarely by much and they still usually beat EPS estimates for the quarter.
* IBM had little to do with Red Hat's maneuvers around CentOS (I worked at Red Hat for several years and still have friends there, and nothing anybody there said publicly about CentOS in 2020 or 2023 was materially different from things people there were saying about it internally in 2012). Some people have tried to blame IBM for a general culture shift but as far as I've seen, every bit of the CentOS debacle was laid squarely at the feet of Red Hat staff by most in this industry -- as it should have been, since most of those involved were employed there well before IBM bought the company.
IBM's reputation as an aging dinosaur was well-earned long before it bought Red Hat, and continues to be earned outside it. That earned reputation was why they bought RHT in the first place: IBM Cloud market share was (and still is) declining and they wanted a jumpstart in both revenue and engineering credibility from OpenShift in particular.
I expect, like RedHat, that the Hashicorp acquisition will result in a lot of startups that do not need enterprise-grade products shifting away from “anything Hashicorp offers that needs to charge money for Hashicorp to stay revenue-positive” and towards “any and all free alternatives that lower the opex of a business”, along with derogatory comments about IBM predictably assigning a non-$0 price for Hashicorp’s future work output.