The snippets contain sensible data of Stasi victims and often false statements about them. There is a specific law governing the handling of Stasi files, regulating who can get access to what.[1]
It also contains compromising information about agents and informants. At one point there was a concern people would turn on each other. Now almost everybody involved is either elderly or dead.
[1] Gesetz über die Unterlagen des Staatssicherheitsdienstes der ehemaligen Deutschen Demokratischen Republik (Stasi-Unterlagen-Gesetz - StUG), https://www.gesetze-im-internet.de/stug/BJNR022720991.html (in German)