Marketplace listings invisible to logged-out users due to deceptive 200 status codes

A developer discovered that a marketplace platform returns a 200 HTTP status for product listings to logged-out visitors, but serves only a generic, empty page shell. This makes the listings effectively invisible to search engines and users without accounts, despite appearing functional. The deceptive status code prevents search crawlers from dropping the page and misleads monitoring systems. In response, the seller built an independent, static page to display product details publicly. The developer urges marketplaces to render critical information server-side for logged-out users.