That's the reason I put that part in italics.
The Bitcoin network is primarily designed to connect individuals and enable then transact directly. But with the growth of Bitcoin and the inclusion of other factors, we have seen a growing number of platforms intended to connect buyers to sellers, streamline the transaction and protect both parties, such as; centralized exchanges, escrows, payment processors etc. If you use any of these, it's no longer a trust less exchange as one needs to rely on the trustworthiness of the exchange, or the escrow provider. 3rd parties have jumped on this opportunity already.

If you want to bypass this, you can use direct OTC (Over The Counter) trades and decentralized exchanges.