You could do the Alexa integration for radio ads today. The choose your own ad would only work for people listening to a podcast in an integrated player on the podcast's website. This would not work for people who subscribe to the podcast and download an mp3.
For the downloaders, you can only really target ads based on download time and IP address. I don't think this is much better than radio ad targeting for most use cases, as IP addresses aren't very good at consistently identifying an individual. I do at least hear local pre-roll and post-roll ads for non-local shows.
For the downloaders, you can only really target ads based on download time and IP address. I don't think this is much better than radio ad targeting for most use cases, as IP addresses aren't very good at consistently identifying an individual. I do at least hear local pre-roll and post-roll ads for non-local shows.