I'm not a big fan of Uber, but this seems like a case of "confirmation bias." The author formed an opinion, then searched for anything that confirmed it and accepted that as proof, even if it was completely unrelated or just due to chance.

It's called "dynamic pricing" for a reason. Like stock market prices, it fluctuates rapidly based on hundreds of factors.

You don't need credits to see different prices—just compare with a friend's phone. Sometimes, their fare will be higher than yours, and other times, it will be lower.