Just a guess, but I’d assume that the bandwidth costs vastly outstripped any donations received.
With the announcement of Swiftly it would be great if the Swift project supported .Debs for more distros than Amazon Linux or CentOS. Personally, I’d like whatever needs to be done to support Raspberry Pi OS (which, I assume is basically Debian).
Support for installing Swift on that OS would be a great boost to the idea that Swift isn’t just for developing for Apple hardware. The Pi hobbyist community is relatively large and prominent. It could be a great promotional tool for Swift.