No. Every customer sees the same two buttons, and the Google one comes first. Google forbids asking only happy customers for a review, so the page never asks for a rating before showing the link.
To your account on vCardGen, and to your email (5 mails a day at most; every message is kept in your account). They are never published.
Google's code holds your review link and nothing else. This one opens a page of yours: it comes with a sign to print, counts its scans, lets a customer write to you privately, and keeps working if your Google link changes.
Yes. Everything on vCardGen is free.
You fill in the page first. To put it online we mail an 8-digit code to your email: there is no password, and we mail your private messages to the same email.