because for most people they don't need what deno promises.

me for example only use nodejs or bun to run a basic sveltekit server, so it can render the html for the first time. all core functionalities are delegated to backend services written in crystal or rust. I don't need some bloated js runtime that hoard 500MB of ram for that purpose (crystal services only take 20+ MB each).

bun promised a lean runtime, every essential functionality is written in zig to increase the speed and memory footprint. and javascriptcore also uses less memory compare to v8. the only thing we expect is for bun to stabilize and can run 24/7 without memory leaking or crashing.

too bad it is a failed promise now.