What is the benefit of using force download

You can't hide the link, even if you will force users to watch video content online, you can always get the link using Dev Tools in your browser. The only how it might work, that you will have to generate "one-time-use" links for your videos, like let's says MD5 sum of userID+CurrentTime+UserSession or like this. Every refresh/request will generate new link. So, copying and pasting video url somewhere else will produce 404 error.