It works on all devices, to launch Bixby just download Quickshortcut maker app and create the Bixby shortcut and open the shortcut. I don't find Bixby is interesting. Just uninstalled the Bixby.
Thank you for being with Samsung and sharing your concern. We would like to inform you that Bixby is supported in Galaxy S8/S8+ and Note 8. We plan to support more models gradually in the future. Be sure to hit ♡ when you find an answer that works for you.