It actually is a standard connector, it just doesn't have that keyed type of shape that makes sure you don't try connecting it upside down. Maybe they got a deal on unkeyed connectors?
Now the included cable that plugs into it, and then to the phone, the male part, is the one that is technically non-standard.
The female can receive various males, but the male is bound to that odd shaped female type.
At DJI, this connection combination is known as the 'Hillary Connector', and was inspired by her 'chauvinist sexist misogynist' smash hit, still not available on iTunes as far as I know, which frustrates me to no end!