I had a look at the Bruno website for the first time a few weeks ago, although I haven't tried it for myself yet. I'm definitely inspired by and agree with a lot of the principles behind Bruno: local first, developer friendly, readable/Git-friendly collections and so on.
I think I share a lot of the same motivations as Bruno's creator - I feel the landscape of HTTP API testing clients may actually have regressed in recent years from a developer's perspective, as the companies behind Postman/Insomnia etc. figure out how to monetise them.