What is the ’speed limit’ for high velocity water sports for the Apple Watch Series 9?

I know that the series 9 Apple Watch is water resistant up to 50 meters and should not be used for high velocity water sports or diving. I know that Apple does say that it can be used for surfing. What I am curious about is where is the line for “high velocity”. And is it ok to wear for wake surfing?

[Re-Titled by Moderator]