It’s every startuppers dream of entering and conquering the US market. The opportunities in the US are seemingly endless. Your sales suddenly surge, raising your startup’s value and big funding pours in as you meet awesome new investors. Sadly, however, if it sounds too good to be true it probably is. Jakub Kostecki, from Boulder, Colorado, seems to be under the gun in Poland for promising big and not delivering.

Kostecki, who has an American passport, is currently facing charges of tax evasion in Poland. Further, in a sparse article in Polish Puls Biznesu Kostecki appears to have also duped a number of small startups – or at least angered them enough to speak out.

“I lost a few thousand dollars and have already reconciled with this. But I want to publicize the case so that all startuppers won’t enter into bad business relationships,” said one “entrepreneur” who remained anonymous.

Kostecki offered to be an intermediary in the US and support the project and asked for cash. Victims claim that after he got the money, he would start threatening to appropriate the intellectual property that’s been produced and register the brand in the US under his name. They also claim he said he would make websites to blackmail the startup and its founder or inform the buyers of their supposed dishonesty.

PB asked Kostecki about the interactions.

“Indeed, I have a few conflicts and I admit that perhaps, in some cases I interacted too aggressively. We are happy to talk about all this with my partners and I think we can reach an agreement,” he said.

To date there have been at least seven people claiming that Kostecki duped them. They don’t want to brush it under the carpet and pretend nothing happened. Instead they want to warn other startuppers so that they don’t fall victim to the same scams they have. The story is still unfolding and we’ll post more when we get it.