In this day in age it is common for a two-year-old SaaS startup not to have an office. I mean, I suppose it's possible that they have one, but my assumption is that the entire company is remote.
I don't see why their location is particularly important, but if you care, you can look on Kyle's LinkedIn profile, which I was able to browse my way to in about 45 seconds from a standing start from their web site.
The article I just linked to makes it perfectly clear "who's behind" Bitwarden, and you can find it out easily with a few seconds of Googling like what I just did. They're not trying to hide anything from anyone who cares to spend 30 seconds trying to find out.
I care a lot more about the fact that hundreds of vulnerabilities have been submitted to LastPass's bug bounty program and they haven't chosen to disclose any of them, whereas a much smaller number have been submitted to Bitwarden's program and they've disclosed several. P.S. I, personally have reported three different security issues to LastPass, none of which have been fixed (https://medium.com/@QuantopianCyber/hi-george-a16d88a37355).
It's clear to me that LogMeIn, which owns LastPass and has a big-deal, flashy "About" page, is much less security-focused than Bitwarden. What you're asking for feels more like security theater than anything that's actually relevant to security.
Just a general "About" page of where it's located, who's behind and a photo of CEO with added bonus if there's a photo of their office.
It's a very security oriented product. Not showing who they're can be taken as hiding.