I wrote to Apple Store and asked for all my money back that I have paid for LTP over the years. To be fair on Coradine, they have agreed to give me a full refund - even though I made the payments more than 60 days ago.
I think I will still move to mccPilotlog though, as they are offering a one-off payment for lifetime cloud sync, and I really do not like committing to subscription software.
I would only consider staying with Coradine if they reduced their subscription price substantially - maybe $20 per year max.