They were issuing presumably hundreds of thousands of requests a day and not offering a penny. You will get banned for that on absolutely any service. Any of them, GPL or not.
That's not the complaint that Matt made against them, though. His complaint in public is all about trademarks and revisions, but then when they sent him a cease and desist asking him to cut it out he decided to cut them off of the plugins store to hit their customers (who are WordPress users).
That's the point, they weren't doing business.
They were issuing presumably hundreds of thousands of requests a day and not offering a penny. You will get banned for that on absolutely any service. Any of them, GPL or not.