The lazy approach to this method:
1. Pick a tube with high traffic.
2. Go to google, set the search filter to 2015-2017 and set it to search within the tube with the "site:" filter
3. Search for different domain extensions. Start with the free ones like .tk, then the cheap ones (xyz comes to mind), then com/net
4. Make a list out of the domains that you've just found
5. Check if they are still registered, make a list of the expired domains
6. Go back to google and the tube, search for the expired domains. Again, make a list what domains have videos with the most views, most followers, engagement, whatever you want.
7. Buy them and redirect them to your offer/smartlink. I strongly suggest tracking your traffic(take a look at bemob, it's free up to 100k hits). You can make a lander for maximum effect. It's also recommended to split-test offers, quite easy to do with bemob.
I spent 70$ on domains, 100 organic hits/day (and a fuckload of bot traffic). 10k+ videos uploaded, over 40 million views.
The roi is super good, 250$ last month, and it's already over 170 this month