Maybe should’ve read your own link there, pretty clearly explains what autonomy means 😂

The autonomous status of Åland was affirmed by a decision made by the League of Nations in 1921 following the Åland Islands dispute. It was reaffirmed within the treaty admitting Finland to the European Union. By law, Åland is politically neutral and entirely demilitarised, and residents are exempt from conscription to the Finnish Defence Forces. Åland was granted extensive autonomy by the Parliament of Finland in the Act on the Autonomy of Åland of 1920, which was later replaced by new legislation by the same name in 1951 and 1991. The constitution of Finland defines a “constitution of Åland” by referring to this act. Åland remains exclusively Swedish-speaking by this act.[15] Although a referendum to join the European Union had been held in mainland Finland on 16 October 1994, Åland held a separate vote on 20 November as they were a separate customs jurisdiction. EU membership was approved by 73.64% of voters.[16] In connection with Finland’s admission to the European Union, a protocol was signed concerning Åland that stipulates, among other things, that provisions of the European Community Treaty shall not force a change of the existing restrictions for foreigners (i.e., persons who do not enjoy “home region rights”—hembygdsrätt—in Åland) to acquire and hold real property or to provide certain services.