Many researchers were not compliant with their published data sharing statement
Not a researcher, but I built a data governance system for sharing medical research data. When interviewing people, one thing that surprised me initially (but which makes total sense in retrospect) is that most researchers do not want to share their data. They want to keep it proprietary until they have published as much as possible on it. In many cases, their funders require the data to be shared, so they go through the motions, but if you give them a chance they will almost always try to deny access to anybody else. They're very afraid of someone coming along and publishing on their data before they do.It's very much not an open source mentality. Everybody wants other scientists to share their data, but nobody wants to share their own.