Apache 2.0 is a permissive license, so if you contributed to the project under the Apache license you gave them permission to use your code in closed-source pro

Apache 2.0 is a permissive license, so if you contributed to the project under the Apache license you gave them permission to use your code in closed-source projects (as long as they follow the terms of the license, such as giving you credit). Of course, they can't un-license code that they've already released, but they can re-release the old code under a new license, and ship all new code under that new license going forward.