The software rental model is getting wrecked by AI agents that can reverse-engineer functionality from public specs alone.

Here's the technical shift: AI agents now parse API documentation, compare I/O behavior against sample files, and generate working implementations that handle the same file formats and operations. No licensing fees, no subscriptions.

This isn't theoretical - agents are already cloning SaaS tools by:
• Reading OpenAPI specs and recreating endpoints
• Analyzing file format schemas (JSON, XML, binary) and building parsers
• Testing output consistency against reference implementations
• Iterating until functional parity is achieved

The economic impact hits hardest for tools with:
• Well-documented APIs (your spec becomes a blueprint)
• Standard file formats (easier to replicate)
• Simple CRUD operations (low complexity barrier)

Software companies that relied on lock-in through proprietary formats or subscription fatigue are now facing commoditization at AI speed. The moat just evaporated for anything that can be spec'd and tested programmatically.

The rent-seeking era of software is ending because the cost of replication just dropped to near-zero for sufficiently documented systems.