I thought a number of vendors sell "OCP Accepted" products that use the OCP designs? I've not yet watched the presentation, and I'm not familiar with this stuf

I thought a number of vendors sell "OCP Accepted" products that use the OCP designs? I've not yet watched the presentation, and I'm not familiar with this stuff, so apologies if I'm missing something, but what is the difference between buying a server from Oxide and buying e.g. https://www.opencompute.org/products/109/wiwynn-tioga-pass-advanced-2u-ocp-server-up-to-768gb-12-dimm-slots-4-ssds-for-io-performance https://www.opencompute.org/products/109/wiwynn-tioga-pass-a... (from one of the vendors on the right)?