And Trenitalia blamed the passengers, because many of them received a warning SMS but didn't drastically change their plans to adapt to the train's new schedule!

I just turn it off, and it generally need to recharge in the next day afternoon.

You can (although probably the typical buyer of a deGoogled phone wouldn't). There's a lot of open source of more privacy respectful maps/navigation apps available and a Murena Maps is on beta now.

Oh ok, now I understand better!

I don't know about Murena Maps (because it's not yet ready for a daily use) but neither CoMaps / Organic Maps / OsmAnd nor the preinstalled Magic Earth seem to require family location sharing. I agree that having a complete selfhosted setup may be requiring too much from the average user. The OSM based solutions are a good compromise to me, aren't they?