And because they create so much noise, no option left for a new comer other than trying to shout louder than them. All-in-all a vicious cycle of spamming!
Channels get saturated and marketers start looking for new ones with les noise/competition.
The oldest that I can think of is old school markets where is shops yells to tell you how good of a deal you're gonna have if you buy from them. I think they date back to the middle ages, no?
I can't hear them here in Canada, and indeed, I can't hear everyone on the planet who is shouting.
Unlike spam.
You got the initial product invite from the GP?