EU membership is more fluid than US membership. and i’m not an expert on it, but my understanding of its origins is as an economic partnership first (promote a unified currency and compatible border regulations between member states). AFAIK the EU can’t declare war and has more limited funding/taxation options (e.g. rather than an individual income tax, the closest it can accomplish is a tax applied at the level of the member nation, and limited to 1.4% of GNP). that said, the US as a federal institution also started small and gained greater powers over time, so maybe this won’t be as significant as i assumed.

as for litigation, i thought it was the individual member states that were suing Big Tech. i thought the only role the EU itself played here was that of explicitly stating the conditions under which members can do such things.