[jbj]

One thing that always puzzled me about telegram was seeing maps being loaded from yandex when sharing locations with friends

[ffpip]

I think it uses Google by default because Google Maps is the best in almost all regions. It gives you an option to change

Maybe Yandex in Russia only?

[jbj]

For me it was using Yandex in Denmark

[saagarjha]

For me it uses Apple Maps?

[Yetanfou]

I never share my location with anyone other than by telling them in normal language than I am at some specific location ("the ferry terminal at Marstrand" or something like that). I don't give the few apps I still use - I try to use self-hosted web services where possible - access to location data, other than those which need it to function (OsmAnd~ etc.). To use some WWII-related terms, "Feind hört mitt" (seen om german-language equipment, it means "the enemy is listening in"), "En svensk tiger" (a Swede stays silent (so that the enemy can't listen in)) or, more tangentially related "loose lips sink ships".