Ah interesting theory, yep could be. A broken bot. Interestingly there is only an email address field and nothing else, so maybe it's failing to recognise that

Ah interesting theory, yep could be. A broken bot. Interestingly there is only an email address field and nothing else, so maybe it's failing to recognise that it's not a comment section/forum. Interestingly it always visit the homepage, and within 1 second sign up to the newsletter, and then it does a random walk through about 5-10 pages (always different links) before stopping. So maybe it is looking for a forum or something.