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Luckily, this time. Not all startups who provide a service like this may choose to do the same when they implode.

Also many (the majority?) of Parse users signed up with them so that they wouldn't have to self host anything.

yes. Meaning there is a market to fill. Too small to be of interest to Facebook, but I'm sure people will build business upon the open source server.

using a service and using open source/open standards/etc aren't mutually exclusive things.