Digg didn't "die" from a single change. It bled users over the course of multiple changes. The size of the waves was based on how many users were affected. The big wave was when they redesigned the whole interface.
I don't think Reddit is done changing, so we'll see where things go. I know that eventually they'll kill off the old interface, and that will lose a large portion of users as well.
I've used Pocket Cast for a long time now. I bought it probably about 10 years ago. It recently went open source.