Pushed up a day thanks to a leak, GitHub has made unlimited private repositories available for developers on the free plan. Most people on the Pro plan probably have it because of wanting to have a few more private repositories. Now, there’s no need to pay for that.
What happens if you keep paying for the Pro? You can look at the pricing page for all the details, but as far as I’m concerned, the big reason to pay for Pro is having unlimited collaborators on a private project. If you don’t use this, then you can probably stop paying.
Unless, of course, you find yourself liking the new Pro features which arrive in the future. Whatever they might happen to be.