And as lots of people have already pointed out, an ad-free version would be pirated instantly. This way they make some money out of the Android user base.
Personally I suspect that once the hive mind gets to work even ads will stop working and Android will simply not have any commercial-grade software whatsoever.
Personally I suspect that once the hive mind gets to work even ads will stop working and Android will simply not have any commercial-grade software whatsoever.