Regarding those screenshots:
But then visitors immediately have to create an account with pportal .io to actually get at the newsletter/sign-up/etc.?
I had a quick look at your main page but it did not answer that question.
I understand that a web dev who wants to offer this has to open an account or get an api key of they want to use your service.
Also I could not find a link to the git repo.
edit: according to OP’s answer it is as I thought. Yet another company that collects data both on sites and their visitors. Another iteration of the good old Free model a lá Google.
edit2: my personal recommendation is still that people get themselves at least one extra email account with plus-addressing. From a trusted provider of course.
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