You trust a decentralized network of computers running code, not just a single one, that's the main point.
There's both centralized and decentralized exchanges available.
There's both centralized and decentralized exchanges available.
There are a lot of banks, with different interests that usually compete with each other and work under regulations that have been discussed and approved after reaching consensus
There are several different central banks, that work together under regulations discussed and approved because they reached consensus
The "decentralised" exchange already exists