It does not appear that you can add YouTube channels to exclusion placement lists in Scripts, although in can be done in the UI by navigating to
Placements then
Exclusions. If this becomes available, we will post about it on our
blog. However, you can exclude YouTube channels, but you cannot add them to exclusion lists. Excluding YouTube channels can be done through the
YouTubeChannelBuilder. To exclude the channel, use the
exclude method instead of the
build method.