When you share a YouTube video using the share button it adds “si=some_unique_code” to the URL. If you don’t remove that it shows your personal account to anyone who receives it so that they can chat directly with you. For a lot of people this is their real name.
I’ve seen it all over Lemmy so I figured I’d mention it here! You only need the stuff before the question mark in the URL to let others see the video.
This can also be turned off in your YouTube settings under the privacy section. The setting is “channel visibility for shared links”. It will still add the si code for tracking though.
People who grew up when smartphones were already a thing might never have needed to learn how the Internet and URLs actually work. To a lot of everyday users nowadays, the Internet is just a series of smartphone or tablet apps you switch between. I used to think that the spread of the Internet into more segments of society would create a society of computer nerds, ha ha ha ha ha nope.