Comment by gus_massa

They use the patent loophole. From https://www.zama.ai/post/open-source

> If a company open sources their code under BSD3-clear, they can sell additional licenses to use the patents included in the open source code. In this case, it still isn’t the software that is sold, but rather the usage rights of the patented intellectual property it contains.

Every day I like the Apache licence more.