Deno is still around and is even actively used, you have to use it if you want to write a Supabase edge function, for example. But it’s not used in mainstream development from what I can tell, it just never took off because it’s a very large idea shift from Node that requires a decent sized learning curve to figure out. The benefits are also not enough that it’s worth re-learning how to write server-side JavaScript. If you wanna write server-side JavaScript, Node is good enough that it’s not worth re-learning.
Still though, Deno is fairly obscure from a mainstream development perspective, and that’s what I wish on Bun.