One thing I am always aware of are apps that want permission to access Bluetooth and/or Wi-Fi and/or Networks.
Even though Bluetooth is very short ranged it can still be used to tie you into a location within a database based on other database records that are more detailed.
Yeah, I love playing you “My Great Dog-sitting Simulator” (not a real app) but you do not need access to my BT. The OS handles sending your audio to my headphones!
FTFA: “Launched federation for self-hosters and developers. Now there are over 1,000 other personal data servers (PDS) outside of Bluesky.”