What is the survival rate of podcasts?

Could you elaborate on what you mean by the "survival rate of podcasts"? Are you referring to the percentage of podcasts that remain active and continue to produce new episodes over a certain period of time? Or perhaps you're asking about the success rate of podcasts in terms of audience engagement, advertising revenue, or other metrics? It's important to clarify the specific aspect of podcast survival you're interested in, as the answer will vary depending on the criteria used to measure it.