They've blocked you from even using or looking at the Youtube website? 
“What I meant was, if you’ve never signed up to post on YouTube, why would they ban you? Is it a cross-ban between some Google service you use and YouTube?
It just sounds strange. It would be for me as if I watched some music on YouTube one night, and the next found I was pre-emptively banned from posting, even though I never had. I’d say,
“WTF?””
... ..
I’m telling what I know.
I was looking up info on Vidman.....
Now banned.
Wow.
And weird.
They've blocked you from even using or looking at the Youtube website?