Nobody invented the mispronunciations, it just happens, which is why the manual included a guide. The inventor of the word (and the format) had to tell people how it was pronounced and why he chose the name, just like every other brand name.

What is recent is the fallacious arguments related to how acronyms are supposed to be pronounced, part of a larger trend towards obstinate and belligerent defense of an objectively and demonstrably false argument. The internet has made people feel like their opinions are just as valid as facts.

In the 90s, we nerds used technical terms like a shiboleth to separate other nerds from what the French call "les incompétents." But it's unlikely anyone would have corrected you back then, because doing so was considered impolite and elitist.

I see it as part of what Colbert called "truthiness." There is no rule for how the word should be pronounced, but it feels like there should be, which is why the argument is so often repeated. The feeling of being right is more important than the reality of ambiguity, and people seek out validation of their presuppositions. It's that overconfidence that fosters animosity towards debate, which is why people get so heated about silly things like this.