If you are scared someone stole your business because they saw your source code a few years ago, then I argue you don't know what is the value you deliver. Code is one of the least important bits :)
https://intuitiveexplanations.com/tech/replit/
Saw a great thread on this today:
https://twitter.com/Julian/status/1404545905483681796
A project or company is a system. Code is only a momentarily artifact the system produced. If that artifact is still all the value you have, the system is dead.