The current restrictions are outdated and discriminatory, but the claim that "donated blood is tested" is misleading. Donated blood is tested for many diseases, including the causative agents of AIDS, but these tests can't detect infections that began within the last few days before the blood donation. So the tests can't screen out all cases of HIV.
Blood donated by gay men isn't 100% safe, even after screening, but neither is blood donated by others. The reason the restrictions are discriminatory is that the rules are based on sexual orientation rather than on the real risk factors, primarily promiscuity. The U.K. has changed their rules accordingly, but the U.S. FDA is still dragging its feet, doing a study instead of changing the rules.
The FDA hasn't bowed to pressure from citizens, other government officials, blood donation centers, or the rule changes made in other countries that have already made this evaluation. So I don't think Apple would be any more successful.
The results of the FDA study should be published within the next few months, but even if the results show that the wrong risk factors are being used, the FDA's plan is to do yet another study. The end of this process is not yet in sight.