It would work for some of Uber's ads. From the article, it looks like they were frauded mostly by in-app ads. And they were paying for installs - not actual trips.
So, no, Uber's advertising here is a little different than (I think) the majority of companies. They are mostly paying for installs rather than sales / conversions. A lot of newer "app" companies could be in similar situations.
Though, honestly, this seems like a massive fail on their analytics team for not figuring this out earlier. They should have been able to see that all of these "installs" from certain advertisers were not leading to trips.
In fact, it says they turned off 66% of ads. They didn't randomly turn of 66% of ALL ads. They turned off this TYPE of ad, which they failed to earlier recognize was ineffective.
Step 1) assume your ads won't work.
Step 2) have enough analytics / logging in place to convince yourself the ads do work.
Step 3) if they don't work, turn them off.
Looks like they skipped step 2 - which honestly, is not uncommon for a fast growing business - even if they are huge and already make a lot of money.
What they found isn't even what people are discussing. They found that certain networks they were buying ads from were almost 100% fraud (which is pretty well known).
Instead, people here seem to be discussing that most online advertising is fraud, and/or that there's no way to prove it's effective. That is absurd.