Do podcast guests get paid?

I'm curious to know if podcast guests typically receive monetary compensation for their appearances on shows. As the popularity of podcasts continues to grow, it's interesting to explore the business model behind them and understand how guests are compensated, if at all. Are there any industry standards or does it vary widely based on factors such as the size and reach of the podcast, the guest's expertise or popularity, and the nature of the content being discussed? I'd love to hear more about this from those in the know.