Go! was clearly a toy language created only for the purpose of writing papers. It has no applications outside academia. Meanwhile Google's golang exists mostly in the sphere of practical use.
Programming languages don't have to be for the purpose of industrial software construction to be considered useful. In fact, many ideas that industrial languages use come from academia. If we want new ideas and new languages to flourish, it cannot be the case that large corporations get a free pass to just smash researchers' academic efforts when they feel like it, especially when their motto at the time was "Do no evil".
My point is more that these two occupy two distinct areas. For example, the word "cool" has two very common meanings depending on whether you're talking about temperature of an object or the value of something in social context. Yes, it would be very confusing if "cool" had multiple meanings from the same domain, but that's not the case. Similarly, golang and Go! are terms from different domains. One is domain of practical engineering, and the other is academia.
