The Surprising Economics of Free APIs: Why Companies Give Away Data Worth Millions

Last month, I discovered something strange while building a security tool. VirusTotal lets you scan files for malware — for free. They analyze each file against 70+ antivirus engines. The compute cost per scan must be enormous. Yet their API is free for up to 500 requests per day. Why would a company give that away? I went down a rabbit hole and found a pattern that explains why some of the most valuable data on the internet is available through free APIs. The Pattern: Free Data, Paid Intelligence Here are real examples: Company Free API What They Sell VirusTotal (Google) 500 scans/day Enterprise threat intelligence Shodan 1 query/sec Bulk data + monitoring Have I Been Pwned Email breach checks Domain-wide monitoring GitHub Full repo/user data Copilot, Actions, Enterprise Reddit Public JSON endpoints Advertising platform The free API is not the product. You are the product — or rather, your data enriches their product. Every time you scan a file on VirusTotal, you're training their mal