I'm a huge fan of kagi and have been paying for it for as long as paying for it has been possible - that said, I think the author is spot on about the long term viability of the project considering their limited funding, limited employees, very wide (yet unproven) interests AND a leader who's maybe not so receptive to feedback.
For example I was part of the Orion beta and I left feedback in the discord that it took ~30 seconds on the then top of the line iPhone (13 Pro Max?) to load the interface which made it hard to use and I thought it was unreasonably slow and he said something like "that's not slow it's totally reasonable" and since then I decided it wasn't worth leaving any more feedback and have since left the community.