AMI retention & publish process to AWS

Greetings! Can someone please explain the process for publishing Fedora AMI's to AWS?

I see the "official" Fedora Cloud page has 'Click to launch' base images
for AWS here: https://alt.fedoraproject.org/cloud/

However, if I click to launch the GP2 HVM AMIs, I see the us-west-2 (Oregon) AMI listed is
ami-3dea475d, which was published 2016-11-15.

Do new AMI's get published on a particular cadence? If so, how/when does that happen?

If I search for AMI's from the Fedora account ID (125523088429), I can see AMI's
as recent as January 29th.
https://us-west-2.console.aws.amazon.com/ec2/v2/home?region=us-west-2#Ima...

Are all images published by the Fedora account suitable/recommended for use?

I'm assuming that the newest AMI's would have all updates and patches up to date
as of the publish date, is this correct?

What is the retention policy on AMI's? Can we count on a particular AMI (eg;
ami-d27bc3b2 ) being available and not disappearing for a specific amount of time?

Thanks for your help!