The standard solution for dating apps is to snap the location to the nearest x kilometer grid point, so that you are losing information rather than simply adding noise
https://robertheaton.com/2018/07/09/how-tinder-keeps-your-lo...
https://robertheaton.com/2018/07/09/how-tinder-keeps-your-lo...
Reading it, I'm not so sure it's "standard," as it seems Tinder-specific, but they have done their homework.
I'll have to see what I can do to incorporate something like that.
I'm sure a dedicated geek could still figure out how to hack it, but our target demographic, despite clamoring for privacy, tends to do Facebook "checkins" all the time.