Who's on the low end? Even junior positions are paying close to 100k in some areas, with juniors in the bay making more than that. There are some true-entry level positions and areas (midwest, less urban) that pay less. Academia as well. But if you're talking about overseas devs, even they are charging more these days (40+/hour) for any sort of quality work. You don't want anybody touching your app (or having access to your code) if they don't have a high level of skill and professional accountability. Outsourced teams are often used for MVPs or prototyping - but then these companies call on devs like me when they get serious about their product. If teams of poorly paid devs could compete with highly paid devs, they would already be doing so - outsourcing of development started decades ago and the trend has reversed. You get a much better product with someone who has an intimate understanding of your business and your application, so "gig economy" type of work is generally limited to wordpress-style sites for your local pizza shop.

As someone hiring devs, the push is always towards higher pay. Even with competitive salaries, it's hard to find good senior devs. That tells me that our pay isn't competitive enough (or our recruiters suck, but probably both), which is just going to push our salaries higher.