No, it's not really easier to buy a Wi-Fi dongle. My target device is the Spotify Car Thing and SuperBird doesn't have Wi-Fi components. My Claude Code Pro subscription was idle, so it cost me nothing. Also, according to an article from Tom's Hardware from two years ago, four million Picos have already shipped, so I've unlocked this ability for let's say 500,000 devices. Finally, my day job is in the Wi-Fi industry... this wasn't a learning exercise.
The author's tone when they discuss the cost of the project is self-deprecating. They know it would have been simpler to just buy one.
But also, the author has given the community a great gift, both directly (the blog post and the project!) and indirectly (the idea: what else can be implemented in similar ways).