My advice is to immediately rebrand as gracefully and effectively as possible and use all that activist energy to effect the transition.
They kind of have a point which doesn’t make them right, but they hold all the cards and you will lose this one and regret the wasted bandwidth.
This name is pretty rings rather badly in my ears, though I’m not offended by such things. I’d feel similarly if they had named it “fuck sleep”. I’m not offended by the word “fuck” but I don’t really want to buy products that are named that. Do apps need energy drink names to be successful? I’ve noticed a trend in talking about men’s balls in ads, manscaping, underwater fart jokes. It’s seems so much like idiocracy more then something offensive.
On the other hand a rose is still a rose. So I agree they should probably just rename it. I doubt there would be any major loss from doing so.
Then don't. How is this relevant? They say the app has been downloaded 500,000 times, so many people are fine with the name.
These stories keep coming; they should remind us that nothing is more precious than the open web, and all those stores or walled gardens, their "rules" and vague TOS are the ennemy.
Just because people use the app doesn’t mean they like the name.
This isn't unique to Apple. Debian and other Linux distributions have also had similar discussions when considering the distribution of packages with obscene, morally repugnant or inappropriate names, as well as the package contents themselves.
Whether it's a commercial entity or a volunteer organisation, there are considerations regarding image and reputation. People can and will push the boundaries of what is acceptable, and somewhere you're going to have to draw a line.