Yikes, after completed three steps I was asked for my email. No to your bait and switch, thanks!

It can take up to 10 min to generate a report - I had a spinner before but people just left the page. So I implemented a way to send it to them instead. I’ve never used the emails for anything else than that. Try it with a 10 min disposable email address if you like. Thanks for your feedback!

Ok, seems like your UI is not coming from a place of malice. However, pulling out an email input form at the final step is a very widespread UI dark pattern, so if nothing else please let people know that you will ask their email before they start interacting with your forms.