First of all, I'm not a lawyer or a legal consultant, just a instance admin that wants to make sure that his instance complies.
Lemmy does not store any PII (birthdates, legal names, addresses,securitynumbers). But users are able to share whatever they want. And that can be a problem.
Check out my instances legal page: https://Laguna.chat/legal
In the future I want to make sure that my instances content can only be shared by GDPR respecting instances.
/e/OS it is degoogled but most of the "Google" applications have been replacedby great opensource alternatives or adapted. The app store still allows us to install apps from the playstore but anonymously.