The rest of us are talking about what is holding back typography in apps and how the current licensing regime isn't promoting the use of better fonts in that context. It's right there in the title of the discussion.
That said, there are hundreds of thousands of apps out there right now. Unless you think someone from each major foundry is checking every one of them to make sure they're not infringing, it is self-evident that there are very many companies so small that nobody will notice if they infringe the copyright on a font or two.
It happens all the time, when creating apps, in professional design work at studios, when creating content in-house, etc. Pretending otherwise is like pretending software doesn't get pirated by small businesses all the time, completely unrealistic. You might not have to be Google's scale to get noticed, but I expect the vast majority of people working professionally with fonts could use any extra ones they downloaded illegally with complete impunity. But every time they do, that's probably a failure of the market to generate some revenue for whoever created that font.