There is an option on 3speak, that says if you uploaded the video elsewhere, you decline rewards now. So yeah, that is why. I'm not really sure what that means though, because I dont get anything on youtube, bitshute, or anywhere. So might check it see what happens. My supporter videos are just uploaded here, and on Pateron and Subscribe star, but still use youtube link unlisted, because I can't imbed 3speak in their platforms.