dYdX is a layer-2 zk-rollup-based exchange that is definitely not decentralized in the sense that e.g. Uniswap is on layer-1. It still, however, inherits the security guarantees of L1 despite not being directly intractable with from L1.
And yet they claim right on the front page "Decentralized"
Also L1 exchanges on Ethereum are arguably not decentralised. They delegate power to miners as a shortcut
you guys are up for rude awakening when this rube goldberg machine bricks
would like to point out that HN was also saying BTC was over valued at $1k.
Didn't listen to you guys then, not going to now either.
You're assuming too much.