Oh really? I never felt like that was convincing in any way especially since lot of the stuff in that blog is just uninformed (for example you don't have to pay taxes in many jurisdictions until you hit a certain threshold)
I'm not gonna try to convince you to use Kagi, but I just don't feel like that blog is full of good reasons not to.
I left my small company to go work for a large company since my career has only been in startups and I wanted to see how they do things at a 10k+ employee org. If I end up hating working for large companies I'd consider going back to my smaller company. Not all companies are shitty and not all departures are a burned bridge.