I personally think that Uber is not an ethical company (I do live in Europe). They are exploiting tax and legal loopholes to profit off of both drivers and countries, simply because regulation for a taxi company that would be set up like Uber is does not exist yet and most countries take their time to regulate.
When Uber is put up to the same scrutiny as taxi companies are (to ensure their drivers are up to the same standard), they refuse to compete and instead of paying the same tax everyone else does and abiding by the same regulations everyone else does, they just leave the market.
Don't misunderstand me, taxi service in my country is horrible, they're useless and rude and service is generally bad, but just because that's the situation, we should try and improve that, instead of allowing companies like Uber to exploit the situation.