On the official STEAM forums, user ajcoll5 reports:
"I just got an email from YouTube today saying that a trailer for Team Fortress 2 has just had ownership claimed and that they are putting ads on my video because thats what the "owner" (EA) wants. I wouldn't care if it was Valve, but EA wasn't the one who developed TF2"
ajcol5 additionally took a screenshot of the mail received:
http://img104.imageshack.us/img104/6805/31819553rl7.png
Hit the jump to keep up to date on the development of this story.
Updates:
EDIT 1:
Talking about EA and TF2, it should be reminded that a petition against EA's port of THE ORANGE BOX on Playstation 3 had been started, and signed +930 times. Hit the Alt.source link for more.
EDIT 2:
The thread has been deleted, no explanation regarding that decision was revealed.