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The .xlsx format is a proprietary format defined and controlled by Microsoft Corporation, a private entity incorporated in the United States. In fact, although OOXML (ISO/IEC 29500) has been approved as a standard, its implementation has never complied with the specifications of the standard itself, as widely documented in the literature on interoperability. Requiring participants to use this format as the sole vehicle for structured data entry effectively conditions participation in a public consultation on the availability or willingness to use software produced by a single supplier.
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The price upon introduction in 1991 was around $15,000 for a SPARCstation IPX complete with 19” CRT monitor, keyboard and mouse. Hence use tended to be limited to specialist applications and the one that I used around this time was employed in mobile data network conformance testing.