I think open source projects are great, however I don't understand why somebody would want to create an open source crypto exchange. I'm saying this because I'm also working on a cryptocurrency platform - https://www.aplusdelta.com/ - and I've thought of open sourcing the code.

But why would an open source crypto exchange attract users? What would be the advantages?
This is still a centralized exchange, so it doesn't matter that the source code is available, the owners could still steal everybody's coins and exit scam if they wanted to.
Users who have the programming skills to understand the source code would also be mindful enough not to trust a third party with their private keys, so they probably wouldn't use a centralized service.