For what it’s worth, a bunch of open source stuff is maintained by Meta, that businesses rely on:

Parts of the Linux kernel, including btrfs, cgroup2 (which is heavily used by Docker and similar technologies), psi, bpf, and a few others.

PyTorch, used for AI/ML stuff

PrestoDB

zstd compression library and xxhash hashing library - used by pretty much every database system and a large number of backup systems now

React, React Native, Relay, etc.

Plus all the AI research and models (like Llama) that’s published publicly with generous licensing policies. Way more Open than “OpenAI”.