(((They))) can change the rules. DEGIRO and others also suddenly changed the rules last year, because of MiFID II. You have to do a test and if you don't then you are not allowed to buy certain stocks, only sell if you own those "complex" stocks from before they changed the rules.
Anon bagholder, do you remember our conv here? How are you doing? What do you think?
Q, it's really amazing! Btw it's possible bagholders can win in the end, but I was not able to play the game. I never finished the test, let (((them))) do a test!