This has been my experience for a long time. Swift is nice but why would I waste my time working on a language that is too tied to the Apple platform even if it's open-source when we have more universal scripting languages like Python, or languages like Kotlin that are compiled but have more support (because I trust JetBrains way more than Apple at the moment), or languages that are most strict like Rust but have more momentum and safety?
They painted themselves in a corner. Apple being the best computing platform while trying to please everyone can never be a serious proposition. Either they are the best and everyone uses macOS, or we have to be so careful that any alternative is more interesting that what they propose.