In WordPress 5.5 which is on track to be released in August of this year, there will be a new feature for automatic plugin and theme updates. Currently, the featured plugin is not merged into WordPress core but is on track to be merged for the WordPress 5.5 release.
Automatic updates for plugins and themes feature will do anything by default since it is a manual opt-in from the plugin list screen on a site. Since you are already using MainWP to deal with plugin and theme updates on all connected child sites then to stop clients from setting
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