What are the limitations of deploying my application to meteor.com (aka, what is the catch?) I assume there must be something about it that would keep me from running something like Facebook or StackOverflow off of it.

Examples of what the limitations might be:

* I'm limited to X concurrent users.
* I'm limited to X requests of type Y per time period Z.
* My database is limited to X GB.

I found this thread from 2012 that suggests there are no limitations:
<https://groups.google.com/forum/#!msg/meteor-talk/HqDvR1sF3-4/YEqrXpDqVGcJ>

Is the only limitation still just that I have no guarantee of service and what they have is what I get? If that's the case, what do they have powering the service, and what kind of load is it under?

Are there any legal things I should keep in mind while doing this, IE, is Meteor copyleft or am I forbidden from making money via whatever I host there (ads or otherwise)?