What is stopping you from selling in Europe Marketplaces?

Although the current Amazon European market is down compared with a couple of years back (I have been selling in DE for quite some time), I still think the potential is huge and the opportunity is similar to the opportunity in the US about 10 years ago. The market is new, developing, and eventually will grow tremendously.

However, I see a lot of sellers in the UK (which makes sense, because of language and logistics until before Brexit relatively cheap and easy) but so few sellers in the other marketplaces, especially in the big ones (Germany, France).

Why do you think is that? What is stopping YOU from selling in the EU?