Huh? The title of the blog post is "Kagi Assistant is now available to all users!". Their users are people paying for what up until now was just their search service. They're now rolling in Assistant as a value-add. Your subscription price didn't increase. You're strictly getting more for what you were already paying. If you don't use it all, you're no worse off than you were yesterday.

If you want metered billing, there's no shortage of AI services that offer that option. Kagi even offers one by way of the FastGPT. You can also pay to use their search API if you don't think the subscription is worthwhile. You can cobble something together with Open WebUI pretty easily.

I have Kagi Family plan for my household. I've been paying for the Ultimate upgrade for my account in order to access Assistant, but given how infrequently others in my family would use it, it never made sense to upgrade them. Still, it would have been convenient if they could occasionally access Assistant. And now they can. And my bill didn't increase. And they're being incredibly transparent about what the limits are and why they're there. I'm a really happy customer today.