I can't swear that developers are setting updates to reengage users. My first suspicion would instead be that very frequent updates without obvious impact are e

I can't swear that developers are setting updates to reengage users. My first suspicion would instead be that very frequent updates without obvious impact are either bugfixes, or somebody running/settling A/B tests via pushed updates. That said, I have seen mobile game devs show daily user charts that rise (relative to installs) after updates. It wouldn't shock me if people had decided to capitalize on that.