Of course, but once we all do this, how do you imagine a world without CEX? Which kind of platform do you imagine for P2P for Bitcoin and how is the price determined?

One example for P2P transactions is what Chia Network did with Offers. You create an offer (1 Chia for 100 USDC) and post it on the official site. One can download the file of that offer insert it in their node and do the transaction if they believe it is worth it. I am not saying that this is the best method and real time spot sale, but its a pure P2P.