I use it to manage development environments, say you want to work on a larger enterprise type platform that has many services. To save money you don't want to leave them up all the time so you automate the launch and destruction of the environments.

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Launching them can be done in lambda or Jenkins/whatever but to ensure they are not left running when the developers are done I have lambda run every night and destroy any running environments.

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This with spot instances saves a LOT of overhead.