Sure, link me to your codebase and I'll give it an active try and lets see what happens.

There's no doubt putting up your source code makes your business much easier to copy. If I spent a year building something sophisticated with the intent of selling it, why would I give someone else, with possibly more resources to market, a free competition? It may have worked out for you, but I think so non nonchalant saying "its not a problem ever" is rather bold.

This is a known problem even in the hardware space, where Chinese companies will copy an existing problem 1:1 and flood the amazon market with 20 different listings.