Yep, it’s weird that some Euronext Stock Exchanges are present in Trading 212, and others don’t.
It should simple and fast to add all the Portuguese Stock Exchange stocks, they are so few.
But some Portuguese large companies are present in the major European stock indexes, for example, on the various STOXX and MSCI indexes (market capitalization, sector, factors, ESG, etc).
Also the Italian Stock Exchange is a missed major market. Italy is 3rd largest Euro Area economy (only behind Germany and France, and in front of Spain and Netherlands already present in Trading 212). Before it was owned by London Stock Exchange and now it was bought by the Euronext. I hope, it could now also be added to Trading 212 markets.