Whose form is this?
It looks like the employer built it. Usually they bought it, and a handful of companies supply almost everybody.
The address bar is the giveaway. A link that goes to job-boards.greenhouse.io or boards.greenhouse.io is Greenhouse. jobs.lever.co is Lever. jobs.ashbyhq.com is Ashby. Workday is the outlier and announces itself differently: it puts the employer's own name in front of myworkdayjobs.com and asks you to create an account before you can start.
Often the address bar shows none of that, because the form is embedded inside the employer's own careers page rather than linked to. It is still the same form underneath, and the styling is a theme.
This is why the questions repeat. You are not filling in forty employers' forms; you are filling in one form forty times, with a different logo and a few custom questions bolted on at the end. The custom ones are where the interesting questions live, and they are usually the shortest part of the page.
What this tool does with it
It fills the one-page applications served by Greenhouse -- the same filler is pointed at other one-page boards too, but Greenhouse is the only board we have measured it filling. Either way it stops at the review page with the window open. Queue a batch and it works through them in the background, leaving each one for you to read. You submit them yourself, one at a time or in one sitting.
A queued job gets its link checked for shape first, so a URL obviously wrong for that ATS is caught before a browser opens it; a single job is opened directly, with no check. Neither fetches the live page. A posting pulled after you found it is caught by the next scan of that board instead: it drops off your list, and a queued job the scan no longer returns is flagged before the browser opens. Until that scan runs, nothing is flagged.