I know I’m preaching to the choir here, but this may help some of your friends or family who are on the fence about making the switch toward more open software solutions.
Sorry, I’m not a regular poster so I don’t know how to make a FOSS version of a YouTube link.
IMO, just drop the canonical YT link and let people handle it themselves (some Lemmy frontends will rewrite them to Piped/Invidious based on preference, some use browser plugins to redirect them, there’s an annoying bot that auto replies with Piped links, etc).
I’ve always found it annoying to have to deal with links to some random Piped/Invidious instances that are overloaded, slow, unreliable, and/or halfway around the world from where I am. A direct YT link is much easier to automatically re-write to use my local/preferred Invidious instance than having to know about every possible Invidious/Piped instance in the wild in order to detect them.