So as a consumer, why do I care?
1) Because hopefully you're a moral being and recognize that this is immoral, wrong behavior on Uber's part.
2) Because in the long run this is going to cost you money. If Uber runs Lyft out of business, you can be sure Uber will be able to raise its prices. Further, even if they don't, this is raising Lyft's costs and they will pass those on to you. Or Lyft won't have a taxi available when you need one because it was on another Uber-induced wild goose chase.
But I really hope #1 is the main reason you'd object. I'm sorry if #2 is.