You can disable embedding in your video details. But that's really dumb, because if they are getting lots of views and making money, it's helping your video rank high because Google and Youtube look at links from other sites to rank videos. It counts as a link when it's embedded on a website. If it's a do-follow website or an authority site, it's really good for your video.
For example, high times magazine featured my video on their website. Only about 3,000 people clicked on my video from their site, but my rankings soared a few months after that because it counted as a backlink from a popular site. That video now has over a half a million views thanks to them. If I search for certain keywords in Google, my video is at the top of Google results.
You need to learn more about internet marketing and SEO. What you are doing is bad if you want more views and want to rank higher. You should welcome people to embed it, and who really cares if they are making money from it, it's not hurting the money you make in any way.