Why is "Institutional seats of the European Union" trending?

Wikipedia Overview

The seven institutions of the European Union (EU) are seated in four different cities, which are Brussels (Belgium), Frankfurt am Main (Germany), Luxembourg (Luxembourg) and Strasbourg (France), rather than being concentrated in a single capital city. The EU agencies and other bodies are located all across the union, but usually not fixed in the treaties. The Hague is the only exception, as the fixed seat of the Agency for Law Enforcement Cooperation (Europol). Luxembourg City is the EU capital that can lay claim to having the most of the seven EU institutions based wholly or partly upon its territory, with only the European Council and European Central Bank not having a presence in the city. Over the years, Brussels has become the EU's political hub, with the College of the Commissioners — the European Commission's politically accountable executive — and the European Council both meeting at their Brussels-based headquarters, and the European Parliament and Council of the EU holding the majority of their meetings annually within the city. This has led media to describe it as the de facto "capital of the EU."