people who earn on twitch, instagram, etc use dslr or mirrorless cameras, unless the video requires a phone in hand.

I know the "standard setup" shown in media, and advertisements, etc shows a ring light with a cellphone using the front facing camera as the recording device, that's just not technologically feasible.

And for the record, i move 4k and/or 108MP images from my phones via wifi or cellular, using synology diskstation autosync or syncthing, respectively. I've used syncthing to upload unedited 4k30p drone footage with no issues, and when i get home, it will sync to hard disks in addition.