A friend submitted an otherwise desirable collection of jpg photos to a non-profit archive only to have them rejected because of issues with jpg: The archive said that each time a jpg photo is opened, data is lost, with the final result the disappearance of the file. So the archive accepts no jpg materials. I'd never heard this before, but wonder!
Complete nonsense. The JPEG format is, as described in the documentation that defines it, an archive format. No data is lost when a JPEG is opened for viewing.