I also checked and there is no mobile restriction on the OpenJDK.

  Are there any restrictions on what I can do with it?

  OpenJDK is released under an well-known open-source licensing model, that places no restrictions on your
  ability to run OpenJDK. Please check the legal section of the OpenJDK project site to understand the scope
  of your rights and obligations.

The legal section contains the GNU General Public License, version 2, with the Classpath Exception.

So you're wrong. This also explains why Oracle went for the hail mary copyright claim on the SSO of those 37 Java API's - because it's all they had.