You can trade wallet to wallet without the need for a crypto exchange. Which is the whole point of cryptos. You need to find someone somewhere that you trust. All BTC transactions are visible, even if your mutual exchange of [USD in a suitcase in a motel room] is not.
Nowhere is it written that exchanges are the only means of trading crypto, but they monopolise the crypto space because they escrow fiat and in theory, respect KYC/AML.
*If you're willing to take the risk, and have no tax position to account for, try hooking up on Facebook or Reddit's crypto groups. You might get ripped off, but you'll remain anonymous from law enforcement.
*The EEVBlog is not a crypto investment forum.
[edit] @Ben321, my advice to you is this: You must be transparent in your crypto dealings. Even if you have a poor credit rating, a criminal record and no valid ID, it is still in your long term interest to sign up to a 'legitimate' exchange; that's one licensed to operate by the SEC in the USA, the FCA in the UK, or the equivalent worldwide. Cryptos are an unregulated market for a good reason, and for a good reason, unregulated markets attract the regulators focus.
It is noteworthy that in many jurisdictions BTC is not regarded as being cash but is instead a digital asset. Which means it will attract capital gains tax. There is no value in trying to find the most unregulated dark web crypto exchange as every trade in your wallet is recorded on the public blockchain forever. Think 25 years ahead, when a loans adviser asks you some tricky questions about your financial proberty from three decades ago?
As you will be aware, the crypto market is becoming a buyer's market. After the recent crypto correction and bear market pressure from high interest rates, the market is possibily reaching the bottom of it's downward trend. But even if you deal Russian Oil with Tether [not that anyone is], you must present yourself as a legitimate wallet holder. Anonymous dark exchanges outside of regulatory jurisdiction are not a legitimate starting point.