HN user
You make a lot of great points here. Almost all of the features you call out are actually provided by an open source project called Kalm (https://kalm.dev).
Certs, ingress, cicd integration etc. all come out of the box
This is both amusing and actually feasible
Re: Why launch an entrepreneur...
There's actually several use cases here that are worth noting. As technology improves, more and more centralized crypto exchanges (where the majority of trading volume currently lies) are creating decentralized counterparts - yielding lower custodial risk among other benefits. Also, newer blockchains that don't have DEX's yet are completely untapped markets for developers. Lastly, there are a variety of different use cases beyond just an exchange that benefit from basic exchange templates: prediction markets, decentralized lending, etc.
Disclaimer: I work for Hydro (https://hydroprotocol.io/), a competing product.