Probably many things... Google hype, popular cloud native open source projects showing its potential, well known creators, good to acceptable tooling, strong

Probably many things... Google hype, popular cloud native open source projects showing its potential, well known creators, good to acceptable tooling, strong standard library, low memory footprint, concurrency, simplicity, productivity, the whole philosophy behind it. Some of these are questionable, but I heard all these by some people. What does this say about Swift's chances to gain mainstream popularity outside of the Apple ecosystem? Probably nothing, as the languages and the circumstances are so different.