The reason it's become so rare is most companies in this space (heck tons of tech companies period) have used a business model of offering a thing to one group of users and then turning around and selling the results of that thing to another group of users, where the latter group is the one actually driving your revenue. This by default almost assumes a hostility towards the former group because their interests will of course be at odds with the interests of the latter group.
What's refreshing about Kagi and other new tech companies is they have dumped this model in favor of having just one group that they serve and drive revenue from (ie. the 'old' model).