Marc Seitz, identified as a contributor to Papermark's open source and enterprise projects, has publicly accused entrepreneur Nico of stealing proprietary code for a data room product being promoted under the UseCorgi brand. The accusation surfaced on X (formerly Twitter) on June 25, 2026, where Seitz directly tagged prominent figures in the startup ecosystem including Garry Tan, Snowmaker, and Y Combinator's official account.

The Allegation: Copy-Paste Entrepreneurship

In a post that has since garnered over 93,000 views, Seitz wrote: 'It looks like you didn't vibe code your data room but stole it from Papermark's open source and enterprise-licensed code.' He demanded an immediate takedown of the accused product, framing the situation as fundamentally different from the typical 'move fast and break things' mentality that pervades Silicon Valley.

Code Theft or Aggressive Competition?

The accusation cuts to the heart of a growing tension in the startup world: where does rapid prototyping end and intellectual property theft begin? Vibe codingβ€”the practice of using AI tools to rapidly generate code with minimal human oversightβ€”has become increasingly common, but questions about the origins of that generated code remain largely unanswered.

The YC Connection

The mention of Garry Tan and other Y Combinator-affiliated accounts in Seitz's post suggests this isn't just a dispute between two companies. Y Combinator has long positioned itself as the gatekeeper for legitimate startup activity, and accusations of IP theft within its ecosystem carry particular weight.

What We Don't Know

As of publication, Nico and UseCorgi have not publicly responded to the allegations. The full extent of the claimed code overlap remains unverified by independent sources, and no legal proceedings have been announced.

Key Takeaways

  • Papermark's Marc Seitz accuses Nico/UseCorgi of stealing open source and enterprise-licensed code for a data room product
  • The post has received over 93,000 views on X since June 25, 2026
  • Seitz explicitly calls the alleged behavior 'fraud' rather than acceptable startup practices
  • No response from the accused party has been publicly documented

The Bottom Line

This situation highlights how vibe coding culture is creating new gray areas around code ownership. Whether this accusation holds water or turns out to be competitive mudslinging, it underscores that AI-assisted development doesn't absolve founders of knowing where their codebase actually comes from.