They weren't "locked". You could play any game with them. They just didn't support Bluetooth at all. So you had to use them wired, or wireless over WiFi (for be

They weren't "locked". You could play any game with them. They just didn't support Bluetooth at all. So you had to use them wired, or wireless over WiFi (for better latency when connecting to Stadia), but there is no standard for controllers over WiFi, so that part only worked with Stadia. I can't blame them for not wanting to implement Bluetooth when it wasn't a requirement for Stadia. Bluetooth seems like a nightmare to support. But now they can release this as an unsupported best-effort update, and that's way easier. It probably won't work with some devices since they aren't going to test it extensively, but hey, it's free!