This is what I received in the email:

“Thank you so much for your patience through the review process.

I am reaching out to let you know that we are not going to be able to move forward with your Mediavine Application. Our vetting process for sites is one of the strictest in the business, and after a thorough review, we are sorry to inform you that it's not going to be a good fit.

We have a few articles if you'd like to get more detail into our application process:

This one explains a bit about Why Quality is our #1 Requirement.

This one explains What We Look for In an Application.

And here's a bit more info about the Mediavine Application Timeline.

Thanks so much for taking the time to apply and for your interest in Mediavine,”

I now have more than 50k sessions per month and most of my traffic is Tier 1 countries.

How do I know exactly why they rejected me?