Earlier quoted context omitted.
There is no indication they haven't read the article. This product, much like iMessage and others, provides an inferior experience to non-Apple users. It aims to make other devices and operating systems look less capable and cheap. iMessage also partially works with other phones. This doesn't change the fact that its intention is to create a lock-in effect, as evidenced by internal Apple emails.
How so? It just sends a link either in a message or email. Acceptance is done via a web page. How do online invitations ensure vendor lock in? What will prevent me from using another online invite system in the future? I’ve used a bunch in past like evite, paperless post and the cost to switch is nothing.
There's nothing really wrong with Invites if you're happy to only have photos from people with iPhones or to let the music be exclusively chosen by Apple users, but you can't pretend it's a fair and equal system.