As they mentioned, this is what the AGPL license is for. No one is suggesting that the people at HashiCorp should not be paid for their work.
https://fossa.com/blog/open-source-software-licenses-101-agp...
https://fossa.com/blog/open-source-software-licenses-101-agp...
The reason AGPL isn't being adopted in these situations is that it doesn't sufficiently protect against someone doing what e.g. AWS repeatedly does - turning open-source projects into services and then dominating the market while continuing to benefit from the upstream project. See the ElasticSearch licence change for a prominent example.
inbound=outbound license terms is a good norm for FOSS. Why should a software vendor play by different rules than everyone else when it comes to things like copyleft compliance?
[1] https://meshedinsights.com/2021/06/14/legally-ignoring-the-l...
[1] https://sfconservancy.org/copyleft-compliance/principles.htm...