The first video is set to begin playing just before the end, so that you can see the end overlay quickly.
The second video starts from the beginning. Click pause to see the pause overlay.
This setup uses SA5's Video attributes;
This video is an HTML embed, but has rel=0 appended to the URL. At the end, it shows related videos, but only from the same channel.
This video is an HTML embed with no changes from the original YouTube code. At the end, it shows related videos, and YouTube chooses which to show, from any source, including potentially competitor videos.
This video uses Webflow's YouTube Player element. It has the setting enabled "Limit Related Videos to Channel".
This video uses Webflow's YouTube Player element. It has the setting enabled "Limit Related Videos to Channel", as well as the Privacy feature.