I don't understand why a VC who initially supported one idea would or necessarily should support a pivot to a completely different one that they already aren't

I don't understand why a VC who initially supported one idea would or necessarily should support a pivot to a completely different one that they already aren't a fan of. Yes there are some companies that pivoted and succeeded but that doesn't mean there is something special about the pivot itself. It makes sense that your investor, who doesn't like neobanks, would not want to invest in a neobank startup.