Sorry for not highlighting that question more strongly. Once you get there, the personality assessment is over and you’ve moved into demographic research. That’s how they get paid back for building and hosting the test.
Here’s how I described it in the original post:
Pretty much all free online personality tests get paid back by dragging some demographic information out of you. That’s exactly what the test I linked to is doing. So don’t get creeped out when they ask for your political affiliation.