Ask HN: Is it possible to lose all my photos stored in the cloud?

I have all my photos taken on iPhone and stored in iCloud. I'm a bit worried that one day all those photos will just be lost.

I know cloud storage is generally considered a better alternative than on device storage, with good fault tolerance, but is it fault tolerant enough in the long run ? Is it possible that one day all photos will just be gone ?

Are there any other better solutions to store photos safely ?