Got an email from Mapbox this morning saying "Hi there, It looks like your Mapbox account has used 100% of the free services included with your plan." Ok, not a big deal, I'm probably just barely over for the month. Checking... No, actually I went over the free limit weeks ago, but Mapbox didn't notify me until the end of the billing period today. Now I owe them $432. Fine. But I won't be using Mapbox any more.
Anyway, that's why you'll see a different look for the map layer.