Yes, casing matters. It carries meaning.

It's the difference between helping your Uncle Jack off a horse and helping your uncle jack off a horse.

This headline makes it sound like the IT systems of a cosmetic surgeon have been attacked by poultry.

Yes! I originally read the headline as "a turkey" because of the lack of a capital T.

They can call themselves what they want, but it unreasonable of the Turks to expect English speakers to write their country's name with characters which are not part of our alphabet.

Does anything matter? If there are things that matter, grammar is one of those things.

Yes? The country is named Türkiye, we should use that name?

The etymology here is interesting and has a looooong history. The country has officially been named Türkiye for over a century.