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Many devices with DisplayPort output support multimode, which allows the device to switch from outputting DP packets to outputting TMDS-based HDMI or DVI signals. You'll sometimes see a ++DP logo on these ports.
This is also why you don't see a cheap HDMI(source)-to-DisplayPort(sink) adapter, the smarts just aren't built into the source device.
I also encourage everyone to read CFTC response to the Vatican's (!) Congregation for the Doctrine of the Faith https://www.cftc.gov/PressRoom/SpeechesTestimony/giancarlore... It talks about about the social utility of derivatives and refutes the narrative that they are basically tools of "speculation." Traders take on risks others can't bear, creating massive economic value that ripples through the entire system.
(but yes, year added above!)