https://www.sammobile.com/news/original-samsung-galaxy-fold-no-more-updates/
Four years after its official launch, Samsung is ending software update support for the original Galaxy Fold.
Yep, that's a clickbait title. People forgot or don't know that Samsung is just a part of long-term security updates. If you run on Android 11+, Google will also involved with your phone security updates as they are the one making the modular system updates that are separate from OEMs.
Also "will no longer get updates" is totally wrong, that's minimum guaranteed updates, not maximum updates that actually happen with your phone if you ever own a phone for really long duration, especially with Android 11+.
You can check most Android phones these days uses a thing called "Google Play system update". As your phone gets higher Android version if possible, the more modules can be updated. And with Galaxy Fold running Android 12, you can update as deep as critical components like ART and many others without Samsung ever involved. https://android-developers.googleblog.com/2023/08/latest-artwork-on-hundreds-of-millions-of-devices.html
Blame Google for making sh*t OS that is hard to update (they fixed that a bit since A10+), not really Samsung's fault.
Google could easily mandate that their OEMs have to conform to a hardware standard that would enable it to install generic Android versions (be it ARM ServerReady or a spec more suited to mobile devices). Updating many components through Play Store is good for many things but it's indeed not perfect either.