Cannot reiterate this enough:

PLEASE don’t request refunds from Apple for any unused time on your Twitterrific or Tweetbot subscriptions.

It could literally bankrupt small shops like these.

https://blog.iconfactory.com/2023/01/twitterrific-end-of-an-era/

Twitterrific: End of an Era • The Breakroom

Twitterrific has been discontinued. A sentence that none of us wanted to write, but have long felt would need to be written someday. We didn’t expect to be writing it so soon, though, and certainly not without having had time to notify you that it was coming. We are sorry to say that the app’s […]

Iconfactory Blog
@marcoarment does doing the opposite help? I bought another years worth of Tweetbot just to support the cause.
@mingo @marcoarment If you wanna do that, I would recommend buying the Mac version on the website since Apple doesn't take a 30% cut of it.