Cloudflare OS is where security and cost stop being two separate problems.
TL;DR
The security model is the expensive part. Deciding who may let an agent act has to be answered for every role, every agent and every combination — then re-answered whenever any of them changes. Build that yourself and it becomes a product you did not set out to build.
Cloudflare OS is open source and starts from that problem rather than bolting onto it. It is the practical starting point we build on, not a vendor preference.