They all have ways to send screenshots to the mobile apps if I’m not mistaken and with Twitter jacking up API prices since Elon took over, it makes perfect sense just to discontinue support
I haven't used the PlayStation or Xbox ones, but the Switch mobile device media transfer is remarkably awkward to use. The Switch will broadcast an ad hoc SSID which you can connect a device to and then hit a web server hosted by the Switch to get your pictures. As if that wasn't already kind of awkward lots of phones will fight you on connecting to the SSID because it doesn't have an internet gateway, so they consider it a bad connection and just automatically switch back to mobile data.