The funny thing is that Labour under Corbyn isn't exactly "anti-capitalist" per se. The 2017 manifesto includes increases in tax for businesses and high earning individuals and some renationalization of infrastructure, but stops well short of abolishing the financial services sector (which is just as well, because the result of that would be mass starvation). Whether Corbyn, in his heart of hearts, is really an unreconstructed Marxist who wants to ban private capital altogether is not really relevant - although clearly that image of him is a big part of both his appeal to some people and the reason others are averse to him.
What's also notable is that the heads of both Citibank and Deutsche Bank have indicated that they would prefer a soft Brexit under Corbyn to a no-deal Brexit, and I've heard that recent events that have made a Labour victory more likely have caused sterling to rally, not fall.
This is why "follow the money, duh" doesn't, in itself, explain the Brexit phenomenon. The business interests that stand to lose out from a hard or no-deal Brexit vastly outweigh those that stand to gain. It's just that those that stand to gain include people like Farage and Rees-Mogg.