The Talk Show - the most popular (and profitable AFAIK) Apple related podcast. The chance of Gruber going Spotify only are basically 0.
Accidental Tech Podcast - seeing that one of the cohosts (Marco Arment) actually developed one of the most popular podcast apps for iOS, I don’t think he is going to make a podcast that can’t be listened to on his own app.
Under The Radar - another podcast by Marco Arment.
Exponent - Ben Thompson of Stratechery. He doesn’t directly monetize his podcast. He has a very successful paid newsletter. He wouldn’t want to put his podcast out of reach of the most people.
Manager Tools/Career Tools - the only ads they do on their podcasts are for their own products.
Some developer focused podcasts
Various NPR podcasts.
Etc.
All the podcasts I listen to have a vested interests in reaching the broadest audience possible.