Q: Is it ok to start a podcast just for fun?
Yes, of course. It’s ok to do anything for fun. What’s important is knowing why you’re doing something and what you hope to get out of it.
I suspect that many people who say they want to start a podcast "just for fun" are just using "fun" as an excuse to avoid doing the parts of podcast that they consider work, like preparation, detailed editing, show notes, and so on.
Those things aren't necessarily fun, but they are essential if you're interested in growing an audience. If you want more people to listen to your podcast, you have to prepare. You have to have good sound quality and you have to write great episode notes so that new people will find your show through Google and subscribe.
Do you want to grow an audience? Do you care about getting new listeners?
If the answer to this question is no, you don’t need to listen to the rest of this episode. Go make your podcast. Have fun! Do whatever you want, have a good time with it.
If the answer to the question is yes, then keep listening.