I found unlimited invites in Gmail's Inbox. Bug or feature?

We all already know that the Gmail team is trying to reinvent our classic mail view. They recently released a new application called Inbox, which can only be accessed by invite. I am one of the testers of this service and, in particular, a mobile application. So, I noticed one strange thing with which I could give out an unlimited number of invites, and not three, as is the case with standard invitations.

Let's get a look. On my Android phone, I am synchronized with two gmail accounts - my main one and the girlfriend. As soon as I received an invite to Inbox, I logged in through a mobile application through my main account. In the main menu of the application, I saw the ability to switch between accounts on my phone. I tried to switch and - voila, my girlfriend also had Inbox activated, although she didn’t have an invite.




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I also decided to test my theory on another smartphone. I downloaded an Inbox on a girl's smartphone, tried to log in through her account - and I did it again. How so? After all, she did not have an invite.



I decided to go further, added a couple more gmail accounts to my smartphone. In the synchronization settings, by the way, the synchronization menu with Inbox appeared.



Later, inside the Inbox application, I tried to switch between new accounts and each time I managed to log in without an invite. I checked on other smartphones - and saw that the Inbox was available for my other test accounts without an invite, which I added to the main phone.

Is it a bug or a feature? So, I can now spawn an unlimited number of invites to bypass the standard system? Maybe I do not understand something. What do you think, friends, what is your opinion?