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You don't need a DAC with USB C.
You need a DAC somewhere, though there are headphones that incorporate one so that you don't need one independent of the headphones. I just don't know if the parent commenter is referring to ones that incorporate one or not, whether his corner-store-three-pound ones are 3.5 mm or USB C ones.
The DAC is in the same device as for the 3.5mm jack. Sometimes in the same hw, maybe USB chip.
USB-C specifically provides for analog audio pins and specifically to try to make it easier for manufacturers to eliminate the analog 3.5mm jack.
I agree that ones in the headphones exist but it is VERYV rare. Only slightly less rare than USB-A headphones that incorporated their own DAC.
Depends. Some phones can push actual audio through basic USB-C adapter (using their built-in DAC). Some other just won't, and the only way they can work is if you use an active adapter that shows up as an audio device on your phone. It's rarely if ever explicitly said which phone needs an actual adapter or not.
On my old Xiaomi MiA2, the "headphone jack" USB adapter was completely passive, just wiring. It won't work on my Pixel phone.