Earlier quoted context omitted.
And in Office there is even worse to be found: Depending on that locale, that it chooses despite browser settings, you also get different behavior, when trying to open CSVs with literally a _comma_ separator, because Excel thinks, that it must interpret that as a character for making numbers more readable or other shenanigans.
In Germanic countries, it’s common to write numbers like 1.234,56 instead of the anglo standard of 1,234.56. Not just on paper, but also digitally. So a value in excel or a CSV is now 1234,56 instead of 1234.56. As result, CSV needs to use ; instead of , as separator Which is why TSV exists, because the tab character is universal.
My software, including my browser, and my operating system is usually set to English, and I expect spreadsheet (data!) applications to not interpret whatever they want (based on IP address or location of companies or whatever), but actually interpret according to a standard. It is ridiculous for a spreadsheet application reading CSV (C! as in Comma!) to interpret the comma as a visual number decoration, instead of according to format, as a separator of cells.