If you look at their FOSS projects you'll notice they generally tend to be released under the Apache license. A look at their license requirements will tell you

If you look at their FOSS projects you'll notice they generally tend to be released under the Apache license. A look at their license requirements will tell you why - Google employees are required to use it unless they have a reason not to[0] and appear to be strongly discouraged from using copyleft licenses[1]. [0] https://opensource.google.com/docs/releasing/preparing/#license https://opensource.google.com/docs/releasing/preparing/#lice... [1] https://opensource.google.com/docs/thirdparty/licenses/#restricted https://opensource.google.com/docs/thirdparty/licenses/#rest...