Decision fatigue affects your listeners just as it affects you. Every choice depletes their finite brain resources until they default to the easiest option. That option is usually "no" or opting out entirely.
Your audience is likely multitasking while listening. They might be driving or exercising or working. When you ask them to subscribe and share and download and visit a website, you overload their working memory. Recent research suggests our working memory holds only about four items rather than the previously believed seven.
In this micro-episode:
Why multitasking listeners have lower cognitive capacity
The link between choice overload and low conversion rates
Why you must limit your episodes to a single Call to Action