Korg themselves now struggle delivering those synthesizers. In many shops they are sold out for months. They are in exactly the same situation as those small businesses. It's quite disingenuous to blame Korg for a shortage of parts that had no shortage when they designed and first sold those synthesizers (more than two years ago).

Also, even big brand names in the synthesizer world are often comparatively small businesses themselves. Korg is probably a lot smaller than you imagine right now. Their name is much bigger than the actual company.