Giving this a brief necro before my drunk euphoria ends and I forget about this one memory; years ago I played these geopolitical simulators that were like idle games crossed with a multiplayer feud game where you built your nation and flocked into groups to exert your dominance in the world. The highlight of that has to be in BLOC where we formed a Jewish Nazi group and purged our ranks of Goon infiltrators, but our survivalist cousins were infiltrated by the Goons successfully (as they lacked the most kosher of Gestapo) and tricked into attacking us (as the Goons were the established powers trying to halt the rise of new great powers - us, since although we were new we outnumbered them). This crisis erupted into full blown total war and everyone else in the game was disgusted with both sides (not surprising considering both blocs were edgylords edgier than katanas), with the survivalists going underground and the Jewish Nazis splintering off and worming their way into neutral factions whilst materially supporting the frontline. The goons unleashed their chemical weapon stockpiles and superior militaries but then we retaliated by creating hundreds of new accounts, sending soldiers and cash to the frontline whilst dumping all of the new accounts complementary oil supplies onto the markets (this was against the rules, but all is fair in war). This allowed our war effort to continue despite tremendous losses and would make the red army proud, in addition our market efforts caused the entire oil market to crash wiping untold trillions of dollars out of the entire economy (oil prices dropped from around $120-170 to $1-10 per barrel) and eventually resulted in our bloc (that was a few days old) destroying in weeks the top bloc that had been there for years. I remember I had a Chinese communist dictatorship there and I managed to keep my endless human waves of soldiers intact for the final offensive, emerging from the underground with my golden stars and red flags dying on the enemy's homelands, bringing instability to their once great nations and war loot for the people's republic. I then got bored and left, having finally won. We all managed to get our supply lines running well, the South Americans would run drugs for money and the Africans run blood diamonds for money, sending it off to the Chinese for soldiers in return whilst our more developed Arab and Slavic countries sent us soviet jets in return for our materiel.
What's the point of this anecdote?
Well, there was another one of those games, and it let you build a nation that could be anything from a technocratic nudist monarchy to a traditionalist marxist dictatorship or capitalist socialist oligarchy. Difference is, was that there was no warfare. Nations could compete but only in the sense that they could compare themselves with one another, but there was no true competitiveness. The dev was quite a hardcore marxist who wasn't too fond of free speech but was in all honesty quite all right, and had made an all right idle game. When asked why there was no warfare and warfare was never going to be, the dev said that this was because it would bias the game in favour of capitalist war machines.
That right there spelled out completely why capitalism triumphed. Even before in that other simulator with the warfare, even in my 'communist' dictatorship, sure I built houses, hospitals and funded education but when it came down to investment I was just as capitalist as "communist" China is, with the added boon of having lower taxes than some capitalist nations due to abundant war loot and drug/blood money and a shit ton of foreign investment in my special economic zones (capitalist heaven). The game dev of the peaceful world on the other hand let you build a nation that was either prosperous and had a wealth gap between rich and poor, or a poor nation with a small wealth gap between rich and poor (proffering that the latter was always preferable) but a prosperous nation has the means to protect and expand its prosperity whilst a poor one is utterly at the mercy of the former. When power means something, the most powerful ideology wins.
When you cannot compete in the markets for better deals, cannot compete in the fields of war for land, resources and strategic points of interest, when you cannot compete for resources with dollar, barrel or rifle or make investments or give loans to better your neighbour in the promise of reaping grain from them later - only then can capitalism be superceded, and not just superceded in name.