Everyone that shares files that has an account with RLC is at risk. Most videos you see are done in the free areas where you don't need to have an account with RLC .They are upload on Third Party Servers and if RLC happens to see their content they order a Takedown Notice with DMCA which the server they are stored is supposed to comply with the removal of content but some servers are balking at the DMCA.
Those brail looking dots on videos are hard to avoid. They are there no matter what you do.
Pictures you can get a snapshot of the screen and hopefully they are not there when you get the image.
Web Sites such as RLC have a Terms of Service which is supposed to be read by the user before they enter into such an agreement for service but most of the time no one ever reads the stuff as it's to time consuming.