Because the easiest way to cause significant inflation is to increase money supply? No one really uses doge for anything else, so that seems like a very good proxy. If compared to M1 or M2 doge would actually fare much better.
Supply is only half the puzzle. No cryptos actually take into account supply and velocity when attempting to control inflation which is something any economist would tell you is trivially flawed.
Substantially every crypto talking head conflates supply increase with inflation, but they are not the same thing, not by a long shot.
[1] https://www.stlouisfed.org/on-the-economy/2014/september/wha...
Or maybe they're not solely interested in causing inflation, and are concerned about other effects as well? eg. preventing hyperinflation. If all you wanted to do is cause inflation, you can do so very easily with helicopter money.
However, Japan makes me wonder why it is a problem in the first place. I mean, why does a problem need helicopter money as the solution? Why is no other method capable?
Consider this, if you increase the money supply and inflation doesn't happen, then there must be a deflationary force that is equal to the newly created inflation caused by increasing the money supply. This could be enough explain the ineffectiveness of low interest rates (debt must be paid back and therefore no inflation happens) but it is not enough to explain why QE didn't work because the Fed can sit on financial assets forever, if necessary.
[1]: fixed over the short run.
Also prices are sticky and velocity is irregular. Pumping out money is not going to increase prices in the immediate months following regardless.