Even when using semver it just means that there were never any major breaking changes. React is also still 0.x :)
It moved away from 0.x around 6 years ago
React Native is still 0.x, since 2015!
> 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.