Wow, really? "Refund remainder of 1-year subscription that started on X date and ended prematurely on Y date" seems like a pretty basic feature of a payments system. The inability to do that says more about Apple (or Google) than it does anyone else.
> If you have any beef it is with Elon Musk, not with Twitterific.
I don't have a beef with either, as I don't use my Twitter account, and didn't purchase Twitterific.
People who bought Twitterific and pay for a subscription don't have an ongoing business relationship with Twitter/Musk, they have one with Twitterific. When the company you pay for a subscription service stops providing that service -- for whatever reason, even reasons outside their control -- the right thing to do is for the company to refund the rest of the subscription.
For an industry that makes as much money as it does some people appear to be extremely petty about this, if you could afford the app to begin with you can afford to be gracious about it. If you have any beef it is with Elon Musk, not with Twitterific.