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In a centralized exchange the price of crypto is set by exchange itself, which is a monopolistic practice which is not in the case of p2p as people set their own margins for buying or selling, there is competetiveness..
2ndly for a crypto to be cashed out, either you choose to go centralized exchange or you use p2p exchange which provides an escrow service.
Is that a joke?
A CEX doesn't set a price. It is based on the supply and demand, as well the volume.
Additionnaly, a CEX also acts as an escrow service. It connects buyers and sellers and is the middleman between both.