Your phone is almost definitely still using Google services as the backend, MicroG is smoke and mirrors - the front-end libraries are open source, but they still use closed source APIs and send your data to Google unless you have it set up extremely restrictively.
MicroG is an open source implementation of the services. My phone is google free
Your phone is almost definitely still using Google services as the backend, MicroG is smoke and mirrors - the front-end libraries are open source, but they still use closed source APIs and send your data to Google unless you have it set up extremely restrictively.