Channels on YouTube who are desperate for subscribers and popularity (just for the sake of popularity), so they'll tell you to like and subscribe to their channel shortly after one of their videos start. If you're a newcomer and only one minute into the video, you'd barely know anything about the channel or its content, so why would you like the video and subscribe to the channel when it tells you to? Thankfully other channels either ask you to like and subscribe at the end of the video, or not at all because they know you're smart enough to do that on your own.
1 minute into the video Desperate, popularity-hungry YouTube channel: Before we start the video, like it and subscribe to our channel New viewer: Show me the damn video and I'll decide if I want to do that at the end! Quit being a subscriber whore!
Definitions include: One who has sold more than their labor to a corporation or corporations, who has forsaken personal values and done something for corporate money that is unethical, illegal, or immoral.