During my stay in Berlin last year, this kind of topic was the eternal conversation. Everyone kept complaining how the city that has always been "poor but sexy", meaning comparatively low priced while having all types of freedoms, is becoming expensive and restricted, raising the question of where to go next?
Just like in your post, the most popular destinations seem to be on the Balkans: Serbia, Bosnia, Montenegro, or North Macedonia. Costs are low, and presumably stable, and laws are not too strict (depending on what you're interested in - the folks I talked to used 3-day-long techno parties as example). However, on the downside the infrastructure seems to have too much room for improvement. While many people say that this could suddenly get better if the masses moved there, it is really not a convincing factor. Countries like Croatia or Hungary are considered too regulated and expensive. But the latest favorite fantasy of digital (and artistic) nomads is the city of Kaliningrad / Königsberg, once they manage to secede from Russia. Honestly, if that happens, I can almost guarantee that I will be there myself to see it!