Yes. In bounty campaigns. Some campaigns turned out to be real and some are scams.
Yes I have been scammed by different crypto in past which waste my time and money when there was no bitcoin so I was using some other crypto but they all were useless so then I left all of them when [Suspicious link removed]ived to market and now I have more than five years that Im using bitcoin and its only the bitcoin which return me bake all my lose which I did in other crypto so I will must say thanks to bitcoin whatever bitcoin did for me.