Just looked at the Interopen ‘Call to arms’. I think it needs to reference HL7 FHIR correctly as per the license https://www.hl7.org/fhir/license.html
When referencing the FHIR® standard in a web site, document, presentation, or otherwise, please in a place of prominence refer to it as the “HL7® FHIR® standard”. In subsequent uses, please refer to it as the “FHIR® standard” or “FHIR®”, using the ® symbol as often as is practical, at least once on each page of printed matter, generally in connection with the first or dominant usage.