it is only a matter of possibilities and balance. Only economical calculations. EU can't do against themselves. They can weigh very thoroughly advantages and drawbacks of tariff itself and a size of tariff (if any). No one company, even a big one is unable to influence EU politicians for making silly things (same in USA). To start acting politicians needed some related entity to file a claim. I won't be surprised that it was not a "solarworld" initiative.