There's a "skypack is dead?" github issue from 9 months ago. Maintainers haven't answered so I'd say yes, unmaintained. https://github.com/skypackjs/skypack-cdn
I experienced some slowdown recently due to Skypack.
Judging from the Skypack Status page and the absence of
commits on Github, I get the expression that Skypack
is in maintenance mode.
However, I can't find an offical statement from Skypack.