Can't use SourceTree due to broken account creation

When you launch SourceTree (a local client app), it insists on you specifying an Atlassian account. When you go to that web site and try to create one, it asks you if you're not a robot, then makes you click images like a monkey. After 3 minutes, we gave up, because it kept asking us to click more images, then pulled them away and showed others.

TWO people couldn't figure out how to get past this screen.

Why is this account thing even needed? Our Stash installation has its own account system, we really have no need to even have these accounts. Can you please remove this annoyance and let us get back to work?