Unfortunately, I think that once we upload our "art" or "work", we have to accept that we have given it away freely. It is not painful if you are do it for the fun of it. But, if you are trying to make a living, it sucks a lot.
There are precautions that aren't perfect. One I like is on YouTube, but not Vimeo. It restricts viewers to those that have been provided the link. The one that's similar on Vimeo says, "Hide this video from Vimeo.com – I want to post this video on the web but don't want it to be available on Vimeo.com. (This will hide your video on Vimeo.com and remove it from public Albums, Channels, and Groups.)"
The YouTube version works well for this forum when a clip has a specific demo purpose, but the videography is not worth showing the world. You can post a clip that demonstrates a grade or color depth without the finishing of the video with titles, etc.
The Vimeo version might work if you are trying to develop a style, brand or reputation within Vimeo and don't want your audience exposed to junk or test clips. I have not been able to determine if the Vimeo version would block Google searching outside Vimeo searching.