> They can't maintain the code so they are no longer going to maintain the code.

Yes, I don't see the point of maintaining technical debt just for the sake of it.

The security environment in 2026 is such that legacy unmaintained code is a very real security risk for obscure zero-days to exploit to gain a foot in the door.

Reading through the list I don't see it being an issue for the overwhelming majority of Linux users.

Who, for example, still uses ISDN in 2026 ? Most telcos have stopped all new sales and existing ISDN circuits will be forcefully disconnected within 3–5 years as the telcos complete their FTTP build-outs and the copper network is subsequently decomissioned.