If so, I can’t believe anyone would sign up for that knowing your employer then directly knows you’re on blind (and in the worst possible scenario, do a password reset and potentially see your activity). I assume blind keeps your own history; I’ve never actually used it so per speculation.
So they send you an email with an activation code but you don't need to click on any links or otherwise interact with the email. Theoretically, someone else who knows your email could have registered you... Probably not too believable, but you could send the email to your coworkers too to improve your anonymity set