I click the "Use Apple" button and it takes me back at the same page with "you need a valid email account".
This is on the ro.wordpress.com. Maybe it matters.
The problem with Google is that everything is attached to your name. I never write any review on Google knowing that anybody can judge me based on that review alone. Reviews are between me and the target of the review. My coworkers don't need to know what I've bought, where I've been and all my opinions about those things.
They don’t seem that bad here in Eastern Europe. Many times Uber is a bit more expensive than classic taxis. But most important they provide a very good service compared to regulated taxis. To understand what we had here before think of the normal taxi companies as the mafia. All of this while the government and the police did nothing.