Replace Orion with Chrome and Kagi with Google and you will find that we are in the same exact boat. Browsers cost money to maintain. Money has to come from somewhere. If the general public does not want to pay then who does?
Furthermore, what makes you think that Kagi will not one day do the same exact thing that Google has done with Chrome? Are you willing to bet that it won't happen?
And I am not here to bash on Kagi, I am one of their customers but I will not use Orion for the same reason I don't use Chrome.
I get the feeling this kind of product will only appeal to unconscious iOS and macOS users. Windows and Linux users have much better (and freer) options than a WebKit wrapper.
Orion browser is proprietary
That would be my guess.
That might be OK for you, but I have been burnt, as have many others, by proprietary software
If there is a choice, I make it