Removing the app
To remove the app from a channel you can just follow the steps described under Remove Link Spotter from a Team Channel
Besided that you are able to uninstall / disallow the app like any other common MS Teams app. Please have a look at the official Microsoft documentation about how to manage MS Teams apps: Apps and services
Remove app Consent for your organisation
Please keep in mind that app consent isn’t removed automatically when just uninstalling the app from Microsoft Teams!
To remove any permissions granted to Link Spotter you can just follow the steps described here: https://communardo.atlassian.net/wiki/spaces/LINK/pages/1018822694/Authentication+Security#Remove-app-consent
You will be asked again to grant permissions for your organisation next time you try to use Link Spotter after removing consent.