I can't speak for Apple, of course, but some indications of their seriousness are there.

SwiftNIO is a cross-platform asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. (https://github.com/apple/swift-nio)

Distributed Membership Protocol implementations in Swift: https://github.com/apple/swift-cluster-membership

Docker Official Image packaging for Swift: https://github.com/apple/swift-docker

Also, on official https://swift.org/download all releases and snapshots are automatically available for: Ubuntu 16.04, Ubuntu 18.04, Ubuntu 20.04, CentOS 7, CentOS 8, Amazon Linux 2

Official Swift Server work group is a steering team that promotes the use of Swift for developing and deploying server applications: https://swift.org/server/

Swift AWS Lambda Runtime: https://github.com/swift-server/swift-aws-lambda-runtime

Official Swift 5.3 release goals have stated a major goal of "expanding the number of platforms where Swift is available and supported, notably adding support for Windows and additional Linux distributions." (https://swift.org/blog/5-3-release-process/)

Still waiting for the day when import Glibc isn't a thing on Swift examples.

Well, you can help make it come sooner… wink

Why bother when F# already works everywhere where I care about, with better tooling support and the wealth of .NET libraries?

I already have my share of platforms I care about.