It is an industry standard. It is used by a LOT of people. The difference between a de jure standard and a de facto standard is sort of like the difference in American law between direct evidence and circumstantial evidence. Similarly, a de jure standard is usually preferable to a de facto standard, but the latter is still a standard. No, this is typical.
People are like that.
That is why there are family squabbles, civil wars, and battles among and between religious groups.