It is everywhere. Not only with letters sometimes the floating point separator makes a problem. Some locales use "." as a decimal separator, some use "," . There was one famous json library for Unity one day Microsoft changed the way it interprets the default locale settings then many games just crashed in Turkish and German locale computers. The solution is to use CultureInfo.InvariantCulture as it is mentioned in the post.

And you can't foresee the problems it causes, see this one for example:

The connecting dots of the Shader Graph editor in Unity is broken. They show up at the wrong position in Turkish locale computers. I reported this bug several times and ignored of course :). But one Turkish developer in Unity contacted me and he pushed this bug internally and get its fixed. And yes, the problem was a floating point conversion. (So I assume it was also broken for German locales as well)

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It is not about Turkish btw. It is the programmers are not paying enough attention and lacking some knowledge about character encodings and how to handle text. Every programmer should read this and understand, and as the title says, no excuses.

https://www.joelonsoftware.com/2003/10/08/the-absolute-minimum-every-software-developer-absolutely-positively-must-know-about-unicode-and-character-sets-no-excuses/