Only because of the nature of your product...
It's all about the product type, its price range, and the availability of reaching the customers.
A US company that made a general consumer-level (non-pro) 1 milligram scale (e.g., accurate on the weight to within 1-3mg) outsourced its manufacturing to China, which then had the same production lines make 2x the order, placed its own brand/sticker on the additional units, got it into the US, and had the various distributors provide it at a price that was 80% less than the company was selling them.
I bought one off Amazon. Why pay $200 when I can pay $20-$40?
If this is legal or not it does not matter - if it can be done it will be done.
In your case, the time is not just right. But the moment when everything aligns and they think they can compete with you...
Anyway, I am glad to hear that you're having good experiences, and I'd love to hear more about it. How can I contact you?
It's also about the strategy of your development--you can take a few very small actions early on that will make it orders of magnitude more difficult to copy your product. But, generally, it's not worth a factory's time to clone your product, especially if it integrates manufacturing processes they don't have access too. I have this benefit because I work mainly with small factories and while they do cooperate with each other, there isn't the infrastructure or margins to allow them to do anything other than focus on building parts as quickly as possible.
My email should be in my profile, drop me a line!
There are plenty of ways to make your BOM work in your home country, but at least in the US it's surprisingly difficult to get low volumes (<5k units) manufactured economically.