I mean this only makes sense in a world where everyone uses semantic versioning (and the project doesn't seem to indicate this anywhere). Versioning numbers, per se, don't really have any bearing on application stability.
> Major version X (X.y.z | X > 0) MUST be incremented if any backwards incompatible changes are introduced to the public API. It MAY also include minor and patch level changes. Patch and minor versions MUST be reset to 0 when major version is incremented.
> Major version zero (0.y.z) is for initial development. Anything MAY change at any time. The public API SHOULD NOT be considered stable.
It moved away from 0.x around 6 years ago
React Native is still 0.x, since 2015!