Been trialing Vault as a CA for internal use and so far everything seems to work great and setting it up with the documentation provided was quite easy. Furthermore, unlike some other FOSS developers they also provide and support illumos (Solaris) binaries for which I am truly grateful for.
Any yet people still implement on top of and leverage those lower-level libraries poorly.
>Skimming their site they seem to offer some sort of encryption + service hosting?
I believe they have a hosted SaaS solution now, but Vault is FOSS: https://github.com/hashicorp/vault
>I don't see how this is much different than any of the other options out there.
Vault manages your application-level encryption so you don't have to. That's a lot different than most of the options out there.
>And not really an equivalent to using RSA as it looks to be tied to their hosting.
It's not tied to their hosting. Spin it up on some VMs or a kubernetes cluster.
>I also tend to not trust for profit companies with things like this (esp. if it's closed source or I can't know what the servers actually run).
It's open source and HashiCorp... That's like saying you don't trust Linux with things like this because of RedHat.
>Has this service been audited?
Yes.
>Has it withstood against the US court system like veracrypt has multiple times?
Yes.
>Do their founders have any history that goes against good data security?
How do you not know who HashiCorp is?
>Your post sounds like an ad if I'm being honest.
Nope, just a happy user.