Understanding “Design Defect” in Platform Liability Cases

When people hear the term design defect, they often think of something physical—a car part, a medical device, a household product that breaks or malfunctions.

But the law does not limit design defects to physical objects.

In modern litigation, courts are increasingly being asked to examine whether digital platforms—especially those used by children—can also be defectively designed when their core features create foreseeable and preventable harm.

This legal theory is central to the cases involving Roblox, and it is a key reason these lawsuits are proceeding together in coordinated litigation.

What “Design Defect” Means in Product Liability Law

At its core, a design defect claim argues that a product is dangerous not because it was made incorrectly, but because it was designed in an unreasonably unsafe way.

In traditional product cases, this might involve:

A vehicle without adequate crash protection
A consumer product lacking basic safety guards
A medical device designed with known risks that outweigh its benefits

The focus is not on misuse or accident. It is on whether the product’s design itself created a foreseeable risk of harm.

How Design Defect Applies to Digital Platforms

Courts are increasingly recognizing that platforms can function like products.

Digital platforms:

Are intentionally designed systems
Have built-in features and defaults
Shape user behavior through architecture
Generate revenue through engagement

When a platform is marketed to children, the duty of care becomes even more significant.

The legal question is not whether a platform intended harm—but whether its design unreasonably exposed users to known dangers when safer alternatives were available.

This is where design defect theory enters the picture.

What Plaintiffs Must Prove

Design defect claims are demanding. Plaintiffs must generally establish that:

The platform’s design created a foreseeable risk of harm
The risk outweighed the benefits of the design
Safer alternative designs were available
The design was a substantial factor in causing harm

This is not speculation. It is evidence-driven analysis grounded in expert testimony, industry standards, and internal documentation.

Alleged Design Defects in the Roblox Cases

In the Roblox litigation, families allege that specific platform features—when combined—created a dangerous environment for children.

Allegations focus on design choices such as:

Chat Systems

Real-time and private chat functionality allegedly allowed unsupervised communication between children and unknown users, including adults, with limited interruption or detection.

Friend Requests

Once accepted, friend connections allegedly enabled ongoing access without meaningful safeguards or monitoring tied to age differences.

Private Servers

Private game spaces allegedly allowed interactions to move out of public view, reducing oversight and increasing isolation.

Age Verification

Plaintiffs allege that weak or easily bypassed age verification systems allowed adults to present themselves as children, undermining protective measures.

Each feature alone may seem neutral. The claim is that their combined design created foreseeable risk—and that the platform failed to meaningfully redesign despite knowing how harm occurred.

Why This Is an Evolving Area of Law

Platform liability is not settled law. Courts are actively defining its boundaries.

That makes precision essential:

Claims must be carefully framed
Evidence must connect design to harm
Legal standards must be respected

These cases are not about turning platforms into insurers of all conduct. They are about whether reasonable design choices were ignored in the face of known danger.

Why Design Defect Theory Matters for the MDL

The design defect framework allows families to address systemic issues—not just individual misconduct.

In coordinated litigation, this theory:

Focuses on platform-wide decisions
Allows expert analysis of design alternatives
Creates consistency across cases
Supports bellwether trials that test core liability issues

In other words, it is how individual stories become structural accountability.

Experience Matters in Complex Platform Cases

Design defect claims against digital platforms require a rare combination of skills:

Deep product liability experience
Technical understanding of platform architecture
Ability to work with experts and complex evidence
Strategic coordination in multi-district litigation

At Rafferty Domnick Cunningham & Yaffa, we have built our practice around navigating exactly these challenges—translating complex legal theory into real-world accountability.