So, I was watching a video of an acoustic performance from a certain artist on YouTube. Decided that I really liked that version. I searched for that version in the tab DB but could not find that particular versoin. I attempted to post the link in a request thread in the Tab Talk forum. It showed up as a forbidden link.

How come we're not allowed to post links to youtube? I don't see anything in the forum rules about it. Sorry if this question has been asked a lot here, but I just want to know why.

It's a measure introduced to reduce certain kinds of spam but they didn't tell anyone. You need to get to a certain number of posts before they'll let you post links, I'm not sure if it's specifically youtube or links in general. I also don't know how many posts it is.
R.I.P. My Signature. Lost to us in the great Signature Massacre of 2014.

Quote by Master Foo
“A man who mistakes secrets for knowledge is like a man who, seeking light, hugs a candle so closely that he smothers it and burns his hand.”