In the mile mile, if you turn on creative incentives for profit, it is business. However, due to the imperfect copyright supervision of the Internet in China, even if unauthorized music contributions are used, they can pass the trial. (It is recommended to ask customer service first) Only when the copyright owner takes the initiative will the infringing video be removed. However, copyright owners generally do not strictly require small online authors to delete videos. After all, supporting fan creation is also part of expanding your influence. Of course, the difficulty in safeguarding rights is also one of the reasons.
If you have many fans and great influence, you should pay attention to this aspect consciously and use copyright-free music.
If you need some music with copyright fees, you can search the music licensing website on the Internet yourself, and they will provide specific ways to buy it.
This is a related problem on Zhihu: Web links.