It's on their webpage, it wasn't there when I first sub to this plan.
Making it very odd to add such "option" that's not "optionnal".

So I can get a lot of people sign in manually via a form, but they also have to confirm their sub via email. And we have to pay 10$ month to get rid of it ?

Also, "custom HTML" is not true. You cannot add custom styles, or div tags, you can only use the very old fashionned HTML Tags such as "b", "i", "u" but you cannot use stuff that is really helpful to build a solid brand.

This plan is a scam.