I'm 41 and lived through this era and totally disagree with the idea that Microsoft killed Netscape (I don't disagree that Microsoft wanted Netscape dead, I just firmly believe Netscape was doomed anyway).

But if anyone killed Netscape by giving away free software it was the Apache project since for a while selling web server software was a viable business, while OTOH there's really no historical data to support the fact that selling web browser licenses was ever going to be an economically successful strategy outside of niche markets like Opera.

And whether or not Microsoft directly killed Netscape or not, I'd argue that the web would not be nearly the ubiquitous technology it is today if web browser software typically cost money, which means that by standardizing web browser software as free Microsoft did the entire web industry (if not netscape) a great service, really.