Galaxy was really nice for the beginning, as things work somehow automatically which saved us a lot of time and money (and in effect allowed us focusing more on the important stuff -> the product).
We’re currently looking into a self hosted solution as the lack of proper auto scaling is getting more and more out of hand with our increasing amount of users and apps.
We do not have an autoscaling feature and I would not expect one any time soon
We are moving everything to Google Cloud, but Galaxy has no support for it.
Because of that, we developed a package to help deploy to AppEngine as easy as if it was Galaxy: https://github.com/EducationLink/meteor-google-cloud
Run it on your own vm . I have deployed meteor app on Google cloud as well as my own vms . Runs perfectly. Using pm2 and builds generated through meteor build .msg me if you want ant more details