@ajturner: the runtime licenses (at the standard level) seem to be tailored to support apps that operate in an enterprise ecosystem, either ?authorized? by an enterprise AGOL account, an on-premise ArcGIS Portal, or using license codes that have to be purchased in packs of 25 for a few thousand $$.
This is fine for large orgs that have ELAs, but if we were looking to release an app for public use - say for a citizen science type application - and wanted that app to include functionality from the ?standard? license level it would be not only extremely cost prohibitive, but also impossible to budget given an unknown level of public use.
Other complex SDKs like gaming engines go for a flat fee or % of revenue model that is much more accommodating to consumer apps