I am uncomplicated and so is FreeWill.
I have an uncomplicated (financial) life and FreeWill helped me set up a paperwork to start putting my estate in order. I was worried I was going to get up-sold (like other sides) and I do not begrudge the site for being underwritten by the charities. I pledged to a charity that is local to me and I believe in their mission--and to another charity not listed on the site.