How many months have these themes been available? Has it really taken this long for Envato to make up its mind about premium plugins bundling? Or was Envato itself not aware that it was a problem, until the Gravity Forms folks finally figured it out themselves?
This little mess seems (to me) to be a poor reflection of the professionalism and QA standard at Envato much more than the theme creators being some hooligans trying to rip off premium plugin developers. The theme creators weren’t trying to hide anything, it was exactly as advertised. They submitted for code review and was approved (premium plugins included). The themes have been selling for ~half a year. If something’s not allowed, maybe try to discuss it with the theme creators in a timely fashion, not 6 months down the road when you’re caught with your pants down.