Google is well-known for forbidding the use of software using the GNU Affero General Public License, commonly known as “AGPL”. Google is also well-known for being the subject of cargo-culting by fad startups. Unfortunately, this means that they are susceptible to what is ultimately anti-AGPL propaganda from Google, with little to no basis in fact.
I license all my open source server code with the AGPL, and all the better if Google can’t steal my work :smiling face with sunglasses: