The meters on traditional cabs may sometimes be tinkered with, but that's illegal, and in the vast majority of cases they're accurate and legally binding. Whereas with the new wave of rideshare apps there's no indication of what charges you're reacking up until you arrive. You can get an estimate to start with on at least some of the apps but it's not binding, and especially when surge pricing is in effect you can end up with large and unexpected charges that are difficult to predict.
I use Uber and Lyft a lot, and I'm the first to admit that traditional taxis brought this on themselves, by often refusing to take credit cards and by never adopting a convenient method of hailing a cab for the increasing pool of people who use smartphones. But traditional rules around taxis were put in place for a reason, and meters in particular were created and regulated to protect consumers against arbitrary price-gouging.
With your bare hands?!?