Bluetooth used to support file transfers from device to device on feature- and early smartphones no matter the brand; now there's AirDrop (and maybe sometimes Google Nearby, but only if the humidity and lunar phase is just right).
In home audio streaming, there was once DLNA; now there's AirPlay and Google Cast.
We have two mutually incompatible walled gardens, and while life within them is admittedly nicer than in a world of poorly-implemented standards, the walls are getting higher by the day.