I think this is an odd/slightly-disingenuous statement.
I mean, I'm on linux, so I'm not, I'm happily paying for kagi though, and would pay for Orion+ if it was available to me :)
I would also very much like it if Orion was open source, it would make me feel a lot better committing to and recommending a browser if I had actual assurances it's behaving appropriately, beyond a company saying "trust me", no matter how nice/cool they seem at the time.
Honestly, I kinda wish Orion+ was the only option, I think having a free option (and the incentives that can create) is kind of antithetical to Kagi's whole raison detre.