Before stable version x.y.z, if x is 0, then y means major
I mean, it has been around for like 5+ years...
I am even more astounded that people are happy to use a product that by its own definition is not stable.
Same happen in ruby a lot. You find a Gem that claims to follow semantic versioning and it is still in 0.y.z after years of being used in production which flies in the face of https://semver.org/#how-do-i-know-when-to-release-100
However I know of no common versioning scheme where 0.y.z is considered production ready.
OpenSource projects have another pace compared to commercial solutions