The QuickBooks ecosystem is a large driver, but they also offer their payment processing via many other paths. Competition in the space is vast, and a good thing, unfortunately most of the competing products are actual garbage.

Turbo Tax is small peanuts for Intuit, they make most of their money from the Payments division.

I know I could search and I will, but asking for anyone else in case I don’t return - got any source? Cause that would be disgusting if true and yet another cause to avoid SB