What makes Deno more suitable for this than any other runtime? It's just executing JS code right? I wouldn't think this would leave any meaningful fingerprint.
yt-dlp executes code from the website to get the exact download URLs and header values. The websites obfuscate these to prevent downloading. Running arbitrary 3rd party code in Node or Bun might work, but is risky, especially when that code could potentially come from one of the many ads on that video website.