@EU_Commission i don't understand the dic tac toe graphic component but more consumer rights are always great.
The best thing those giants can say is "we will cease operation in europe" because then due to lack of competition there would quickly be european companies offering the same. For example otto.de is a german amazon.com and given a chance would probably quickly grow into their role of european everything-store.

In other words: they can't threaten to leave b/c then China 2.0 would happen