I pay for Kagi. I'd also pay for Orion if it were on Linux. It doesn't even need to be good, I'd still pay for it.

For something as important as a web browser or operating system, I'd want it to be open source. In the FAQ it does say that they're opensourcing components and plan to opensource the browser eventually. This is all good.

Long term though, I'd want it also to run on opensource operating systems. It doesn't exactly make sense to have an opensource browser on a closed source operating system. I use Firefox on macOS (+ Linux) and wouldn't be so inclined if it only ran on Mac and/or Windows.