LDOCE plus was removed (after paid)

I recently found my APP, LDOCE+ (Longman dictionary), purchased a couple of years ago, is not working any more. I tried to reinstall it to see if it solved the problem. Unfortunately, I found that the app is no longer available.

I came across a similar link in the community but was not able to reply.

LDOCE plus was removed - Apple Community

I am wondering if this is some kind of new trick to make money by selling an app and then removing it and forcing a user to repurchase it under a new App name.