All OpenJDK distributions, from all vendors, are also licensed by Oracle (which develops OpenJDK) with the GPLv2+CPE licence. The vendors build Oracle's source code and host branded binaries. If you file an issue, unless it's a problem with the build, they just forward it to Oracle.
Oracle also distributes the JDK with that same licence here: https://jdk.java.net, so there are two Oracle distributions with two different licences, both free but one open-source.
Oracle also distributes the JDK with that same licence here: https://jdk.java.net, so there are two Oracle distributions with two different licences, both free but one open-source.