Why aren't there more tech startups serving B2B /prosumer finance?

I went down a rabbit hole of investigating funds like https://www.motivepartners.com/ and their portfolios. A lot of b2b finance startups in these PE/VC portfolios seem to be very underdeveloped compared to traditional SaaS. Maybe it is because sales are almost exclusively relationship-driven and they thrive on privacy, but I can't help but frown and believe there should be more of these tools, reviews, documentation... Serving PE firms and financial institutions. G2 and Capterra are also underdeveloped in this category.

Aside from this underserved b2b software segment, personal experience in investing has shown me that a lot of the most popular prosumer SaaS like finbox, tikr, koyfin, with huge user bases do not have a lot of employees, and at the same, provide a lot of value to the end user making subscriptions of over $20/mo justifiable for an investor with a relatively small portfolio.

Any reason aside from the regulatory and technical aspects of finance for these projects to be in short supply? It seems like most startups in finance tend to fall in consumer fintech which is a crowded space much harder to stand out in.