You're grossly overstating things.

17.5% stake in Didi Chuxing is nothing to scoff at, especially considering that Uber has done better than both Facebook and Google as far as China is concerned. Apple is the only US tech company that is really succeeding in China.

33.6% stake in YandexTaxi and international Uber users can continue to use the app to hail Yandex drivers when visiting Russia. That's also far far better than Facebook and Google have fared in Russia.

In India, Uber is beating Ola. In Latam, Uber is easily beating both 99Taxis and EasyTaxi. In the Middle East, Uber is beating Careem. Uber is absolutely dominating in Mexico and other Latam countries.

Besides Didi Chuxing and YandexTaxi, the only international competitor doing well relatively against Uber is Grab, and AFAICT, Grab's success relative to Uber is largely isolated to Grab's home country Malaysia and Indonesia where they have invested most heavily. If you take all of Southeast Asia, it appears to be neck and neck.

Uber is doing well in relatively well in Europe all things considered, and winning in Europe is just a matter of time. I highly doubt the local taxi offerings will survive autonomous vehicles.

Gojek is also crushing Indonesia. They started a bankless payments system and are expanding beyond just rides now, pretty cool stuff that dominates in their own market.

They're not anywhere close to leaving India. If you think otherwise, citation please.

Since when did Uber leave the UK? I'm pretty sure I used them a month ago.

South and Central America appear to be pretty locked down. Also Oceana.

What is the competition in Europe besides existing taxi services?

The important thing to notice here is that the economics of this sector vary greatly by country and often times local companies will get a hand from their respective govts. These are fundamental services that provide a livelihood to lots of unskilled labor. One misstep and you'll see massive protests, like what happened in France. I wouldn't be surprised if Brazil for instance has a lot of up and coming competitors.

The engineering talent is severely lacking in Brazil to actually be competitive with Silicon Valley. I've worked in tech in Brazil and I wish it were better. Every single Brazilian engineer I've ever met good enough to work at Uber either already works in international markets like the SF Bay Area, Seattle, NYC and Amsterdam or they are in Brazil working remotely for international companies.

NuBank is the only tech company in Brazil I know of with solid engineers. Globo isn't that bad for frontend. UOL also has one single solid team backend with about four solid engineers.

Brazil's biggest problem is that it doesn't invest enough in education, especially English language skills. Every country competitive in software engineering has relatively strong English as a Second Language skills (at least among their brightest): China, India, South Korea, Japan, Russia, Europe.

If you don't have solid English comprehension among your country's most talented, you'll never produce world class engineering talent in sufficient quantities since the overwhelming majority of technical content is in English.