Mapbox decided to pull a google, well worse then google at least google tells you when something is going to be turned off, by killing the classic mapping service yesterday with no official announcement. Even the error message you get back {"message":"Classic styles are no longer supported; see https://blog.mapbox.com/deprecating-studio-classic-styles-d8892ac38cb4 for more information"} links to a blog posts that states it will keep working after June 1st for old apps!
Any suggestions for third party services like this to transition too, I don't really want to be supporting/reliant on a company that does stuff like this.