Does Excel not provide other functionality and features even though it has a DRM licensing aspect? Of course it does as such an aspect being present doesn't dismiss everything else outright. The same is true for micropayments, that they are there does not dismiss the idea others could find the app (or games in general) a useful functionality in an OS to the point they would consider a core feature.
As an anecdote I've removed default apps while cleaning many PCs and gotten more pushback about CandyCrush being missing than Calculator. Regardless of how much more base utility I think Calculator provides personally it doesn't mean others don't find the same base value in an entertainment component, even if it has micropayments or other revenue streams built in or could be a click away in an app store (as any component could be anyways).
As an anecdote I've removed default apps while cleaning many PCs and gotten more pushback about CandyCrush being missing than Calculator. Regardless of how much more base utility I think Calculator provides personally it doesn't mean others don't find the same base value in an entertainment component, even if it has micropayments or other revenue streams built in or could be a click away in an app store (as any component could be anyways).