Is it permissible for me to speak on my channel – which is free of music – about YouTubers who use music in their permissible content, with the aim of increasing viewership?

Promoting individuals and their success stories on your channel, while the content of their programs includes music, is not permissible. Describing such content as permissible is inaccurate. Nothing equals safety in religion, and the Prophet, peace and blessings be upon him, said: "Leave that which makes you doubt for that which does not make you doubt."