Like many things, it depends. I'm curious about the context where you're actually hearing YouTubers say the letter.

It's usually "zed" and we're taught it as "zed" in school - at least when i was a kid.

If I'm spelling something it is Zed. I don't think I've ever said Zee in that context.

The alphabet ends with Zee when singing it, due to the rhyme with Vee (and probably Sesame Street).

In my head I will say Nissan Zee for a Z type car. Though if I was to speak the phrase "Nissan Z type" I would say Zed.

When it is used in online slang (GG EZ) it is "Zee" for "easy".

ZZ Top is Zee Zee Top. Zorro draws a Zed. Things are Zed-shaped, not Zee-shaped in general.

I am Canadian I say Zed. Plus it’s fun to watch americans lose it when I say Zed Zed Top (heehee).

We are now, no longer the Canadians who say ‘zi’.

both, and i never bother to correct myself, or give it any consideration.

I spell my name with a zed not a zi. From Sask

Zed. Grew up in Ottawa, since lived in Montreal a long time. French also says zed.

Zed. Zee is horrible.

Stand proud, Embrace Zed.

As a mumbling Canadian, I always say Zed to avoid confusion with the letter C.

Regarding your point about Canadian YouTubers, I'm guessing their audience is overwhelmingly American, so they purposely say Z the American way. It also extends to money, temperature and other units. I hear Canadian YouTubers give prices in USD and temperature in F.

It's also zed in French, fwiw

I used to not care about this at all, but recently I am adamant about using zed. Similarly, I go out of my way to use the non-American spelling for any words that have it.

Zed is the proper Canadian way to say it. Those people just probably watch a lot of American content so it stuck for them.

I have to catch myself to not say "Dragon Ball Zed".

Zed

Zed ad absurdum.

E-zed sharpener. Eee Zed Money. That sort of thing.

Drives everyone crazy, especially if it's a Canadian or Commonwealth product.

It'll always be zedzedtop.

Zed

Zed, unless its part of a person/product name where its specifically Zee, like Jay-Zee. Otherwise, it's Gen Zed.

"Zed" now and forever.

Zed

Zed if I refer to the letter itself, but if it's part of a phrase, like "Gen Zee" etc. I will use that.

Gen Zed

I have this nasty habit of correcting people when they say Zee when it is obviously Zed.

I say zed. My kids all say zee, to my chagrin. Thanks, US children's entertainment.

Zed

Zed

Born and raised in the USA, only took a few months of living in Canada to switch to zed.

Also, never seen it spelt "zi" ever, lol.

zed of course.

Don't argue with Meredith Rodney McKay.

It's a Camaro "Zed" 28

But the alphabet it's X, Y, "Zee"

for my family, it’s very much Zed. jay zed, zed zed top,

“Zee’s dead, baby. Zee’s dead.”

Zed.

Dunno who decided zee was a thing, but they were wrong.