a lot of it has to do with culture tbf, dating back to Berlin Wall times and whatnot
basically the "eastern" part (CZ, SK, PL, HU, etc.) was under Soviet/Russian occupation and these countries probably evolved similar cultures and traditions due to that, and because they were obviously more to the east they just named it Eastern Europe
(PS. i'm not a history nerd, these are just rough assumptions)
for me it's...
overpowered terminator expy, overpowered terminator expy, overpowered terminator expy, wannabe austrian painter, gentleman with a minigun, psychopath with a sword that is on fire, and a bunch of randos