Adding channels to your allowlist can be a benefit for artists who don't want ads placed in front of their videos on their personal channel.
If you don't want YouTube to place ads on your videos, you can add your channel or specific videos to your allowlist so that YouTube’s Content ID system doesn't create a copyright claim for that content.
You might also establish a relationship with another channel and clear them to use your content. In this case, you would add their channel to your allowlist in order to protect them from automated Content ID claims.
If you’d like to add your YouTube channel to your allowlist because you prefer to monetize your channel yourself, please keep in mind that in order to monetize your channel without iMusician you must first meet these requirements in order to be eligible:
You must have 1,000 subscribers on your YouTube channel
Your videos must have 4,000 watch hours over the last 12 months
Your channel and content must comply with YouTube's policies and guidelines
You must have a Google AdSense account set up