

Because they’re using them in their products, or the non-public infrastructure that keeps the product running, or their teams are using them internally.
Check the licenses of the projects you listed. If they allow free commercial use, you can assume those products are key to the software somewhere.
Don’t underestimate how much of big tech is made of OSS - companies will always take free stuff. They pay them because if the projects die or are compromised, so are their paid products.










Imagine saying that in a Slack channel filled with journalists and thinking it wouldn’t be leaked.