Back in 2000, I put a profile up on developers.net, which at the time was largely a job board. Job leads were all I wanted out of them (and as I recall, didn't get any useful ones).
Somewhere along the line, they became a "resource" site, and started sending me weekly sales pitches for their sponsors' various products. It wasn't really spam, I suppose, but it was annoying. Only a bit though, so I tolerated it.
Until today. When I went to unsub, they wanted to collect more data from me to complete my profile, before letting me unsubscribe from their mailing list.
Um, no. When I'm telling you to stop bothering me, I'm not about to give you more information about myself so you can market to me better.
Somebody hand me the clue-by-four. Bam! Bam! Bam!
So now there's an entry in their database telling them I'm from Zimbabwe and work for a company called "Bite Me". I hope the marketing drones have fun with that.