I wanted to do the same, to figure out how they make their money, but also a 404: https://squareup.com/help/en-ca/topic/139-square-cash

Looks like the help in only available in US English. If that is the case, and it looks like they are using some sort of CMS, then it should be fixed up and and content fallback to something useful rather than a 404. This is a link off the landing page on a site with very little content, pretty unacceptable in this day and age (but for now there is the benefit of doubt to assume you are doing a beta run for feedback).