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The main scenario is live migration of containers. We have live migration feature in OpenVZ since 2005. But it was always in-kernel implementation of checkpointing Linux processes (https://openvz.org/Checkpointing_internals). Linux kernel developers won't accept our patches to vanilla and we decided to implement C/R in userspace. Others scenarios are here https://criu.org/Usage_scenarios

Some people are trying to use it to do checkpoint restores and hot migrations of containers. For example, if you have a slow starting app in a container, people are trying to use CRIU to create a base container checkpoint, in which the slow app is already started, to generate worker containers quickly.

Running long running jobs on EC2 spot instances. It's not uncommon for a bioinformatics pipeline to have a multi-day runtime. If you can checkpoint every hour or so you can use spot-instances and save ~80% of your compute costs.