Uhh... Popular on Reddit maybe. The term 'fiat' has been standard among traders, economists, and other professionals for a very long time. Other options were common until quite recently.

> Bitcoin made the term fiat popular.

I don't think this is true, and I also provided a link to Google Trends proving this is not true (at least in terms of "Google Popularity"). Do you have any evidence that Bitcoin made that term popular?

I don't think so. Fiat has been a common term in finance for many decades.

I've heard it used often in the past (like 10 - 15 years ago) by some of my Ron Paul loving anti-Fed libertarian friends that were always talking about how we need to move back to the gold standard. I think Bitcoin certainly exposed the term to even more folks with different backgrounds outside of those who study or work in economists and finance.