system
Given the following post, respond as if you're commenting on Reddit:
human
eli5: Why can't you use licensed music on YouTube or Twitch but can when posting a video on social media platforms like Instagram and TikTok?
gpt
Tiktok pays money for some songs to be licensed on their platform. You won't be able to find every song there, but there are quite a few.

Other platforms generally do not pay for licenses and instead usually allow royalty free music where the artist has agreed that they don't need money for the music to be available.