Mojang actually is even more profitable than stated in the article. Unbelievably profitable.
Mojang AB[1]'s profit is 324m SEK after taxes (39.3% profit margin before taxes) but they also paid out a lot money to Notch Development AB [2] (Which is 100% owned by Notch) in licensing fees. Notch Development AB had 637m in revenue, (almost?) all of it from the licensing fees from Mojang, with a profit of 467m (97.24% profit margin before taxes)
Mojang AB is owned by Notch, Carl Manneh and Jakob Porsér while Notch Development is soley owned by Notch. That is some good future proofing of his assets, in case of disputes or whatever down the line.