Yes, I pay with credit card 9/10 times and get a receipt. I doubt any of these companies are big enough to have offshore companies to route their income through.
"Then why not just let them compete?"
They do. There's quite big competition in my city among public transport (city owned), many local taxi companies, private taxi drivers and Uber. Competition is quite fierce and costumers can choose freely whatever they prefer. I prefer taxi, I call taxi, some of my friends prefer Uber - they call Uber. What other competition do you have in mind?
I dont think people appreciate the uneven response. They equate allowing Uber to Uber vs taxis. But thats not whats being discussed: cabs arent banned. Its Uber vs Governments. The foe is large and abusive.
You can exercise your opinion by not taking an Uber. Why would you ban a third person from using uber?
Yes, I was talking only about my city and my personal experience, I agree that it's more of an exception than a rule (at least judging by many comments here, especially coming from USA).
Then why not just let them compete?