Regarding custom Crypto Exchange Development, security depends on how carefully the platform is built and maintained. 

A well-developed custom exchange secures user data and transactions with strong encryption. 

It also includes offers to prevent unwanted access, such as two-factor authentication and secure APIs.  

Regular security checks and updates are required to ensure the system's continuous safety. Additionally, keeping a lot of the digital currencies in offline cold storage reduces risk.

So, while no system can ever be 100% risk-free, a custom crypto exchange can be very secure if built by experienced developers who focus on these protections. 

At BreedCoins, we make sure all these security measures are in place to keep our user exchanges safe and trustworthy.