Well, that's true, but at least now compiler explorer links will stop working when compiler explorer vanishes, but not before that.

I think the most valuable long-living compiler explorer links are in bug reports. I like to link to compiler explorer in bug reports for convenience, but I also include the code in the report itself, and specify what compiler I used with what version to reproduce the bug. I don't expect compiler explorer to vanish anytime soon, but making bug reports self-contained like this protects against that.