So, it is not easy to go into something as major as crypto exchange without being a big company, if you do it from home that is not going to be good at all. I also know a person (from telegram, not real life) who is partners in a big crypto exchange in our nation, it is not globally big, it is just a local exchange that helps you change your bitcoins to fiat to your bank account, so makes things easier. He talked about how paranoid he became because of security concerns. So all the making money part is second issue, biggest problem is security and it is very difficult.
Regarding the issue of trust and security, I think the white label crypto exchange solution should solve this problem. White label cryptocurrency exchange software is a ready-made platform that the provider (company) offers with all the primary features of a crypto trading platform. It has the core functions ready; the front-end can be easily customized to incorporate your brand logo and color theme. They will customize your exchange according to your requirements, so I think from this aspect, trust and security issues can be solved to a great extent.
you can learn more here: https://medium.com/@whitelabelexchange/what-are-the-benefits-of-choosing-bytebulls-white-label-crypto-exchange-d01be13c50b1