...I found this, does this help in knowing why, Nicky...?...
I recommend that you:
Go to your YouTube directly using its URL, but do not try to sign in.
Note the red banner as that gives you the (very general) reason for the termination.
Then, if you believe an error was made, you can request a review here:
https://support.google.com/accounts/...nded?p=youtube.
Make sure to provide your YouTube's /channel/ URL and the correct master/owner Google Account's email address.
Read up on terminations and their reasons here:
https://longzijun.wordpress.com/2017...el-suspensions and consider reading this too, as it has all the information currently to hand on terminations:
https://productforums.google.com/for...be/wQgOwhGPI-s. It should help you make your (only allowed) appeal count.