As of 22nd March, all ROBLOX audio will be set to private meaning that only the audio owners can use it in their games. Audio will be free for everyone to use however you will have a limited amount that you can upload each month. 

Many developers are frustrated about this, including me, because this means that we can’t use audio made from other people. In one of my games for example, there will be no: car audio, helicopter audio, boat audio, music, beach background noises, metal detector audio, party popper audio & much much more.

I am urging ROBLOX to change their ideas, as no one is happy with it. This new system will remove audio from millions of games & cause, what I call, an audio crisis. 

Read more: https://devforum.roblox.com/t/action-needed-upcoming-changes-to-asset-privacy-for-audio/1701697