Doesn't YC have some code of conduct or legal/ethical guidelines? I would assume a legal and compliance department would have some major headache if documented cases of misconduct jeopardize later due diligence. I would not fund or aquire a company on the radar of national regulatory bodies for something as stupid as this.
Regardless of any claims of having this, I would say this behavior aligns with what I have seen over the last couple decades. I'm more surprised that other people would expect anything different?