You are kicking the tires awfully hard for a solution to a problem you claim is easy.
The problem with these VC companies is that they enter the market with a whole bunch of lies and I was convinced that building on my ad hoc scripts wasn’t very useful since there were multiple alternatives including open source ones.
It’s taken me a decade however to learn that if these projects are VC backed as opposed to having some sort of govt or heck, even a benevolent dictator, they will screw you.
And while I might have learnt this lesson, which so much of the knowledge ecosystem also being filled with VC backed individuals (including this very forum) a whole another generation of potential OS developers will learn the lesson also too late.
And that’s how Silicon Valley has built a massive eco system to suck money out of everything across the globe, especially open source, but not limited to it (taxis, restaurants, hoteling, everything…).
Insomnia was an alternative to Postman, raised VC funds, eventually needed to justify that, and suddenly accounts mattered more. They're currently on the same trajectory.
Insomnia is open source but just like OP experienced, a single update can do damage and it takes time for the community to react.
Is this the same company that raised? If so, are you exempt from that? Have you figured out some monetization scheme for what is essentially a glorified curl UI that doesn't incentivize account sign ups?