SpamZilla Founder Reveals What Most SEOs Get Wrong About Expired Domains in 2026 

We analyzed what actually separates winning expired domains from worthless ones. When we sat down with Doug Stewart, founder of SpamZilla, we expected a conversation about metrics and algorithms. Instead, we got a reality check: most SEOs are skipping the one step that determines whether an expired domain will tank, or deliver ROI. Here’s what we learned.

Three surprising findings 

1. The metric everyone trusts is hiding the real problem. DA, DR, and backlink counts don’t show you where a domain has been. According to Stewart, “Domain history and referring domains are at the core of spam checking”, not the vanity metrics most buyers rely on.
2. AI search makes clean domains more valuable, not less. While many assume AI overviews kill link building, Stewart argues the opposite. “The large LLM services use Retrieval-Augmented Generation (RAG). This is how they ‘know’ which websites to link to.” Clean historical domains become more defensible as AI inherits Google’s authority signals.
3. The shortcut only works if you do the slow part first. Stewart built SpamZilla because manual spam checking was too slow. The irony? “If you are going to spend thousands of dollars on a domain name, you want to make sure it will deliver a positive result.” Most skip this step and pay the price.

Key findings

1. History beats metrics

DA, DR, and quick backlink counts don’t reveal where a domain has been. Domain history and referring domains are the core of spam checking, not the vanity metrics most buyers rely on. (Stewart interview, April 2026)

2. SpamZilla was built to fix a gap existing tools couldn’t solve

SpamZilla started as an in-house tool because manual spam checking at scale was too slow. It was built from the ground up, with proprietary infrastructure, because existing tools weren’t solving the actual problem. (Stewart interview, April 2026)

3. LLMs inherit Google’s authority signals via RAG

“LLMs are just scraping the SERP data to determine which content has the most authority.” Large LLM services use Retrieval-Augmented Generation (RAG) to determine which websites to link to, meaning Google’s 20+ years of ranking refinement directly informs AI citation behavior. (Stewart on RAG architecture)

4. Compromised domains become more exposed as AI matures

Stewart suggests that as AI systems improve at reading authority signals, domains with manipulated backlink histories will become easier to identify and penalize, the opposite of what many buyers assume. (Stewart interview, April 2026)

5. Proprietary data is the real moat

“Whoever has the most data wins.” The interface can be replicated and features can be copied, but years of domain data processed through proprietary systems cannot be rebuilt with API calls. SpamZilla’s competitive edge is the data itself. (Stewart interview, April 2026)

What this means for SEO professionals and domain investors 

If you’re buying domains based on DA alone, you’re gambling. Domain history, what niches the domain served, whether its backlinks are real editorial placements or network garbage, determines long-term value. SpamZilla was built precisely because existing tools left gaps in that analysis.

For anyone building in the expired domain space, the implication is direct: compromised domains get exposed faster as AI search matures. Clean domains with verifiable history are the only defensible investment in 2026.

Expert quote 

“Build yourself in-house software tools that meet your own needs. You are your best customer. Grow these tools over time, constantly adding any new functionality to streamline your work. Eventually it will become something other people will pay for. Also, data is the name of the game. Whoever has the most data wins. Google, Meta, Tesla, all the LLMs, they’re all data owners. Become a data owner.”

— Doug Stewart, Founder, SpamZilla

Methodology 

Insights are drawn from a recorded interview with Doug Stewart, founder of SpamZilla, conducted in April 2026. All claims and statistics in this newsroom are derived directly from that interview.

Read the complete analysis with full methodology on our blog → The Man Behind SpamZilla Reveals What SEOs Get Wrong About Expired Domains in 2026

Explore SpamZilla’s domain marketplace → Start Finding Clean Expired Domains