[Mirioron]

That just means you'll go out of business then and the users will end up using a Chinese/Russian/other country (knockoff) instead with the same ads snuck in there. It costs a lot less to develop software in certain other countries.

[makapuf]

You can justify any business with that kind of argument.

[BoorishBears]

Justification doesn't exist in a vacuum, what you're justifying matters just as much, and showing ads from Microsoft is pretty low on the scale of evil things apps do for monetization.