Its a big fucking internet, I dont think "Homegrown Video" should own the term "homegrown"
They may own the term "Homegrown Video" but you can't blame them for trying to twist arms to get anything with "Homegrown" in it. They are probably just taking advice of their overpaid lawyers who only make money when they sue and have to send out letters.
It's dog eat dog out here on the internet!
EDIT: just read the rest of the thread so edit was in order.