The Apache license doesn't say you can't sue the original authors or you lose the right to the code, its all about patent licensing: If You institute patent

The Apache license doesn't say you can't sue the original authors or you lose the right to the code, its all about patent licensing: If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed.