I think he means his friends use location sharing apps, where you can actually tell people "Open this app/URL to see where I am right now.".

I remember installing a dating app one evening, and thinking "I'll look at it tomorrow.". Next evening, I opened and it said "This stranger and you were both at this subway station around noon!". Geezus Christ! I didn't even open the app the whole day! Uninstalled it straight away.

On Android, you can open your Google account settings and disable their always-on location tracking "service". Of course, you have to take Google's word for it, and that doesn't stop GPS from working for apps like Maps when you request it.

I usually leave Location services off. I'll enable them for 5-10 seconds, get the directions from Maps, then disable the Location service again. Of course, they can still estimate my location with cell towers (or WiFi, but I usually have that disabled as well), so it's not a perfect solution. Saves a lot of battery life, though.

you can can disable your access to it and its background upload to google. If you read the fine print the "anonymized" gps/cell-tower/wifi data is still used periodically by google to refine their maps etc. Same for apple, same for the GPS in your internet connected car.

I think the person you are responding to is describing something different. If you use, e.g. Google Maps, to get directions while driving, Google knows where you are in real time but no one else does. If you share your location on e.g. Facebook Messenger, your friends can see where you are for the next hour. Presumably there are other apps which will share it continuously.