I love seeing posts about Emacs from IOS users - it's always autocorrected to "eMacs."

Maybe at some point, but as far as I can tell not anymore (while corrections like "iphone -> iPhone" are still there).

That's good news. It was always funny watching people post in the Emacs subreddit from their iPhones, but it did cause a bit of confusion for those too young to know what an eMac was.

eMacs certainly is broken on my phone. Vim is fine though.

Yes, proper nouns are capitalized.

And of course it's much worse for a company's published works to not respect branding-- a trademark only exists if it is actively defended. Official marketing material by a company has been used as legal evidence that their trademark has been genericized:

>In one example, the Otis Elevator Company's trademark of the word "escalator" was cancelled following a petition from Toledo-based Haughton Elevator Company. In rejecting an appeal from Otis, an examiner from the United States Patent and Trademark Office cited the company's own use of the term "escalator" alongside the generic term "elevator" in multiple advertisements without any trademark significance.[8]

https://en.wikipedia.org/wiki/Generic_trademark

Sure, but software that autocompletes/rewords users' emails and text messages is not marketing material.

Otherwise, why stop there? Why not have the macOS keyboard driver or Safari prevent me from typing "Iphone"? Why not have iOS edit my voice if I call their Bluetooth headphones "earbuds pro" in a phone call?

Sounds like you found your next promotion at Apple. They can change anything. "I like Pepsi" -> "I like Coke" -> "I recommend Company A" -> "I recommend Company B". etc... "I'm voting for Candidate C" -> "I'm voting for Candidate D"

You can market it is helping people with strong accents to be able make calls and be less likely to be misunderstood. It just happens to "fix" your grammar as well.

Because in regards to the rights to a trademark, what is critical is the use of the word in trade -- not just "marketing material" nor your phone calls to your friends.

So if I write a business email to my colleague, if Apple doesn't autocorrect "Iphone" to "iPhone" in it, they risk losing the trademark?

Your emails aren't very relevant. But the way Apple's represents their product is.

Using a trademark as a noun is automatically genericizing. Capitalization of a noun is irrelevant to trademark.

Even Apple corporation says that in their trademark guidance page, despite constantly breaking their own rule, when they call through iPhone phones "iPhone". But Apple, like founder Steve Jobs, believes the rules don't apply to them.

https://www.apple.com/legal/intellectual-property/trademark/...

That explains why Steve Jobs never said “buy an iPhone” or “buy the iPhone” but “buy iPhone” (They always use it without “the” or “a”, like “buying a brand”).

Is that true? If so, what else should Apple call the iPhone in their marketing materials?

I always thought the actual problem of genericization would be calling any smartphone an iPhone.

Imagine how a court case would go where a lawyer wheeled in a Mac and noted it was a default OS install and projected onto a screen the results of querying Apple's AI about Apple products and it failed to adhere to the trademark guidelines.