Why do I have to pay a subscription to mark a movie as viewed?

Hello,
Today I wanted to mark a film as seen, but a pop-up appears asking me to pay the Premium subscription because I’ve reached the limit of the list. What limit? I have 1161 movies marked as viewed, and I don’t think it’s right that such an essential function should be limited on the free version. What’s the point of a movie-tracking app if it doesn’t let me track my movies anymore? I hope it’s a bug, because I can’t really afford such a recurring expense, and lifetime payment is no longer offered. FYI I’m on version 5.2.4.
I hope you can help me, thank you very much.

I want to take a moment to explain why I’ve implemented a subscription model. With the rising costs of server maintenance and ongoing development, it’s essential for me to secure sustainable funding. I understand that $1 per month might seem like an added expense, but it helps me keep the app running smoothly for everyone.

Each of us has financial needs, and this small fee allows me to continue improving the service you rely on. I appreciate your understanding and support as I work to enhance your experience.