Free cities as battle vs others archologys, but its limited in scope, trough diplomacy panel you can invest until taking over control then send someone to manage it (freeing a slave girl, damn, I usually groom a team for this use only.
Open economic warfar, or somev others options, did not really use them at date.
Thing then is that since the hgg thing there no good source for downloading the game, compile from official gitub is the only open option these days. Which mean that its not available for (me) people who don't use pc, android not supporting the runtimes in any case.