Out-of-the-box computers and web browsers come with software already installed to view the most common photo, audio, and video formats. The main issue is that a ZC file is one among many thousands of niche file formats not supported with the typical built-in software. I don’t expect iNat’s geospatial data uploader for Places to work with my Trimble SSF or COR file types, so I convert them to KML before uploading.
Perhaps there should be an “other media” allowance where files types for supporting evidence such as ZC files and other things like genetic data could be uploaded.