Access to code doesnt negate copyright law.
Depending on how openly and where this happens you might be able to get the platform they are selling your software on or their payment processor to take them down.
That's for legitimate platforms and processors of course. If it's on some darknet bulletin board - tough luck. Not worth the time.
It's much easier to take down the services supporting the thief, rather than taking down the thief.
The thief won't care if you tell them to stop. But their domain registrar, web host, video host, social media accounts, and payment processor will care about copyright infringement.
Clearly adding the purchaser's data to each product (think, watermarking a PDF with the name and email of the purchaser) might deter resellers. And would make it easier to trace who's reselling.
The easiest solution is to know your customer and not sell it to someone that will probably steal it.
just ship fast, outsource to virtual assistants or use ai tools/copilot to build anything and launch fast even if its fault. launch 10 times in a 10 months than once every 10 months ig.
Don’t worry about it. Just make sure your product links back to YOUR site for lots of things so that the copycats are giving you free marketing. When you add product 2 that will help!
Also you could mention that people buying from the genuine site get product updates etc. Both on your site and in the product.