This wouldn't work nearly as well, given that trademark law generally only protects marks one actually uses in trade. So, given N and M synonyms for "app" and "

This wouldn't work nearly as well, given that trademark law generally only protects marks one actually uses in trade. So, given N and M synonyms for "app" and "store," respectively, your potential troll would actually need N*M storefronts, each sufficiently similar to one or more of the established app stores to cause confusion and sufficiently successful to be considered "use in trade". In contrast, one can hold patents without making or doing anything (including licensing the patents).