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Super common though. Everyone from Hetzner to AWS does this, unless you specifically pay for full allocation, which is typically ~2x the price.

Chances are you are using systems that do this and you haven't even noticed.

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Werner Vogels seems to disagree: https://twitter.com/Werner/status/25137574680

Tweeted Sep 21, 2010, might still be true for EC2 VMs though.

There's the 't' series of instances that offer burstable CPU. AFAIK still 1:1 on memory though, and there's models that allow you to pay to stay un-throttled when using t family instances vs. getting throttled when out of burst credits.

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