I am very happy to have found this deal. If you are a writer I think it is an offer that you should not miss. In my case, I publish on Amazon on my own and on the other sites I will do so through Publishdrive. Thanks to this platform you can reach more authors in a simple and agile way. In addition, as it allows you to stop the publications, you can continue using Amazon Kdp when you consider it appropriate. So I'll alternate Amazon with the rest of the places. But whoever wants to publish directly on Amazon can do it here too.
I didn't think about it much and chose the Tier 2 option.