Why Taxista asks for your location
So the family who asked can see you coming. Only them, only during their ride, never kept as a trail.
Taxista asks for your location once, on its home screen, after set-up is done.
Allow it. While you are on a job, your position goes to the one family who asked for that ride, every few seconds, so their page can show the car coming and a time. Each position replaces the one before. We keep the start and end of each trip, never the road you drove.
When you are not on a job, nobody sees where you are. Taxista never shows drivers on a map to anyone, and nobody can look you up by where you are.
If you refused it by mistake: Settings › Apps › Taxista › Permissions › Location, then allow it.