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I wonder what this is. Did they create a proper multitenant version of MySQL or are they simply running mysql without a container around it ?

I'm guessing it's the latter (much easier) option, but ... Do you really get 5x savings from simply not having a container ?

Amazon Aurora – New Cost-Effective MySQL-Compatible Database Engine for Amazon RDS

It's an engine for MySQL.

Aurora Database Architecture by Amazon Web Services:

It isn't MySQL at all. It just has a facade on the front compatible with MySQL's API.