Yes, this happened at Google, in a huge way. Ten years ago you would hear interesting things at TGIF, the weekly informational company-wide event people would demo not-yet-launched software and hardware, discuss R&D, etc. After such a lot of cumulative leaks people stopped saying anything interesting at TGIF. You'd get information faster by reading the company press releases than by waiting for Friday.

It's not like the leakers did some kind of noble service, either. They were just assholes who destroyed something nice.