Kinsta has a list of Banned plugins that they don’t allow to be used on their hosting. The complete list of plugins can be viewed here: https://kinsta.com/knowledgebase/banned-plugins/
But even after you migrate your WordPress website from Kinsta to another hosting provider, you are left with this annoying Banned Why? message on some plugins.

To get around this problem, simply remove all Kinsta leftover plugins from the mu-plugins folder:
rm -rf wp-content/mu-plugins/kinsta-mu-plugins/

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