We need to talk about how we do software architecture and technology choices today. In the time you played around with CDN stuff you easily could build a company listing, fixed your footer and header links, thinking about a pricing, build an apply-form, fixed/build job notifications, ...
Maybe the author intentionally set things up so they can have a low stakes system to learn about these technologies and improve their knowledge. This post is about Vercel and their poor practices. Let’s stay on topic and actually ask the author why such a complex setup instead of assuming you know and speaking off the cuff with criticism
I'd go a step further and say the question of why the author may or may not be overengineering their own app is besides the point.
I'm not saying asking out of curiosity would be a problem, but it shouldn't be construed as at all relevant to the very valid points OP is making regarding Vercel's service