Excited to see the continued growth. I'm one of the "early adopters" and struggle to use any other search engine now. Kagi is just that good. I'll be wearing one of those shirts. It genuinely seems like it is meant as a thank you to the early supporters, though hopefully will also be some advertising for them too.
The merchandise might be the first advertising that they do. As of now, all the advertising has been organic through word-of-mouth.