If you ask me, I'd say the basic need for the KYC in an exchange is for security purposes. The DEX has always planned long term goal ahead of the future which theory can never be gone to extinction. While saying this, there's an early view from the SEC that some individuals would take chances to laundering monies using the crypto currencies.
Obviously since cryptocurrencies has been a decentralized non custodian digital assets, it would feel safe for persons to succeedingly launder money illegal through the developed technology and to bridge that fact by having all transactions on tracks, comes where the application of the KYC came through so that every course of exchange transactions can be traceable to indict perpetrators using the medium of the crypto exchange to execute their criminal acts.
Although considering some tenses about this security factors in using the KYC without and official issued licenses, it's a disregard for such a government like that of Nigeria.
I also think that if proper measures are being taken towards the CEX in the sense that the government at some limits follow up citizens using the CEX to executive transactions, the government can as much come in to play the roles of protecting the national interests also as much, the SEC as well could also take its bone of action to protect the reputations of the CEX and Cryptocurrencies as a whole by bringing every perpetrators to book.
The KYC would actually help to build this large and solid security firm.
Being aware about the senate concerning the regulation of Cryptocurrency held recently in Ekiti state, one Sen Biodun expressed that the hash actions the federal government is taking upon the Crypto by the restrictions may not be the solution to how the government think it'd be, while considering the impacts of crypto potentials in the society, restrictions would do it no good. Maybe they as the federal government can play some crucial role of management.
https://twitter.com/PulseNigeria247/status/1359869126785785858?t=c3DsAIpyy4fUF6pOTZQbtA&s=19.
Let's also checkout one Mr Cartier with the attempt to money laundering using the USDT and other fiats with the crypto CEX but unfortunate for him that he was caught.
https://crypto.news/heir-to-cartier-empire-arrested-for-attempted-money-laundering-using-usdt/.
This is a visual power of the impact of the KYCs.
I don't know how many of us can categorically bet on trusting the Nigerian federal government that the masses welfares is their priorities and not having all these Interests on the cryptocurrencies for their Interests while the local crypto Investors and traders like us would be suffocated.