Pro tip: clean YouTube links. When you get a link from YT, it includes an ID tracking back to YOU. It's a "query string" on the end of the URL like this:
...?si=[tracker_ID_here]
This ID allows YouTube (and their owner, Google, and *their* owner, Alphabet, and ALL of their associates) to track the people who click on the link, and the apps they used, back to you, building a network of none-of-their-business.
Good news: DELETE the "?si=..." part & the link works just fine without the tracking.
@VisualStuart In fact, delete everything that comes after /watch?v=[string of letters, numbers & maybe dashes]
How do you know when that string ends? Because it's ONLY letters, numbers & dashes; you start deleting as soon as you hit a question mark, ampersand or other special character.
The only time to not delete everything is if you've chosen to share including a time code. In that case you can remove ?feature=shared from the URL, that's also a data point (though not an identifier)