It is still developed, although it feels a bit like it was mostly "done" 10 years ago.
https://github.com/ponylang/ponyc
Quite a few recent commits and their blog/X account mentioned their LSP now being bundled with the language...
https://www.ponylang.io/blog/2026/02/last-week-in-pony---feb...
Dunno, now it feels like the "hot" thing is either manual memory languages like Zig, Odin an Rust or languages with novel type systems like Lean, Koka, Idris, etc... GC'd "systems" languages like Nim, Crystal, Pony, Go, etc... all seem kind of old fashioned now.
Go seems to have some enduring affection and popularity for new projects and companies. I recently felt like a lot of the recent shift was less about GC and more about runtime characteristics (static binaries, lean resource consumption, lack of an in-your-face virtual machine).
It never felt like Nim, Pony, or Crystal were ever that popular that a diminished hype cycle registered as something thematic to me (not that I really intend to disagree with your perspective here).