Is it possible that a decentralized domain will develop a decentralized exchange?

My first thought was if you will gonna add another Decentralized protocol on the top of another Decentralized protocol making or adding another layer of security but I was wrong. Another bad reason would be it will just make the data redundant or in computing Data redundancy which is a bad practice in data storage technology and I don't know yet if it is applied in BlockChain Technology.

"The more complex the code the more it exploitable"

There is a very big difference and for me I think that the current decentralized domain can't develop a decentralized exchange out of it. First is that a decentralized domain is own by someone who create an account, current decentralized domain has only one protocol that the same with the Traditional domain has and that is to chat, another reason is he/she has full control of the domain that he bought but a Dex or Decentralized exchange own by no one, control by no one, and is mostly using a DLT-Technology.

Decentralized exchange can be traced as early as 2017-2018 and currently competing with the centralized exchange. We know that there were some Dex that had been hacked in its early years for example was Bancor and suffered a loss of around $13.5M. Therefore its not just the good people were upgrading also bad people they are catching up the good people in terms of technology.