So what the manufacturer did was send out an OTA update to versions of the Samsung Galaxy S8 and Samsung Galaxy S8+ headed to Canadian carrier Telus. The update removes the ability of Accessibility Service to intercept KeyEvents, which is how the All in One Gestures app allows you to remap the button. Telus users will have to root the phone in order to accomplish this task. While other variants have not yet received the update to block the remapping, in all likelihood, they will.
A Samsung employee who runs the reviews program for the company subsequently sent out a tweet, confirming that it has blocked the remapping of the button. Good for Samsung. How dare people go out and spend their hard earned money on an expensive handset and then try to reconfigure it the way they want it to be (that's sarcasm, folks). Truthfully, if Samsung wanted to have users press the Bixby button and activate Bixby, well perhaps they shouldn't have launched the feature half baked.
Samsung employee confirms that the manufacturer sent out an update to block the remapping of the Bixby button
source: XDA, @philipberne via AndroidandMe