> people don't actually care. It's just virtue signaling.
"Virtue signaling" is an annoying, low-effort way of dismissing something. Try harder. You haven't even provided any evidence. Here's an alternative proposal: People like doing things that they believe will make the world a better place, within their money/time/inconvenience budget, in ways that are limited by their attention. They're human - they have limited attention, limited capacity for simultaneously optimizing hundreds of metrics, and many competing demands that they're trying to satisfy, so they're not going to be perfectly consistent.
No, one person uninstalling Uber is not a massive blow against evil. But many people uninstalling it has been enough to send a pretty powerful signal that -- in conjunction with a lot of concurrent social and legal factors -- is causing Uber to do a pretty solid about-face.
(And it's not seconds, because depending on where you are, Uber may have many more drivers than Lyft -- people travel, after all, so even if Lyft is equal in your home market, it's not equal everywhere. You're also losing the prospect of alternating apps when one or the other is in surge pricing. If you're a heavy user of ride-sharing services, uninstalling Uber imposes both a time and monetary cost.)
Kudos to the GP and others for uninstalling Uber. And for every other step they've taken to try to improve the world by their own actions.
Dans ses écrits, un sage Italien
Dit que le mieux est l'ennemi du bien.
(In his writings, a wise Italian
says that the better is the enemy of good.)
-- Voltaire
Don't let the pursuit of perfection stop you from doing anything that matters.