It's not supported, and it's particularly tricky to support efficiently for music, because normally music streams (downloading and decoding chunks of audio at a time) using the built-in browser support. If files were obfuscated it would probably have to deoptimize that and fully download and decode music files before starting playback, causing a longer playback delay and higher memory use.
As far as I'm aware, virtually all web games just serve audio as-is. It's not like you're providing a download button for the audio. You'd still have to use developer tools to find the URL for the audio to download, and I think you could argue that is not easy access to download a file. If that was still regarded as easy access by some legal terms, to be honest I don't think that's a reasonable restriction for a web game.