He’s likely referring to this: Can't uninstall Jira Cloud apps after cancelation | Jira and Jira Service Management | Atlassian Support
Apps can’t be uninstalled during trials. You can only unsubscribe, not uninstall. Results in endless negative reviews and wasted time for everyone involved. Has been the case for many years and Atlassian doesn’t care to fix it.
Thus if this extension finder app has no off toggle config and can’t be uninstalled then you’re stuck with it permanently on for ~ 30 days. But sounds like free apps can be uninstalled immediately so all good here.