Wordpress banned forks from the plugin directory a while ago, so they're doing what they ban everyone else from doing. https://make.wordpress.org/plugins/2021/02/16/reminder-forke...
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The linked post also might not reflect the current policies. This update was a security update and was done due to the unique circumstances around the original publisher.
If you "fork" the assets, you're not covered by GPL.
Obviously it's nonsense to discriminate between the free version of a freemium plugin and a commercial plugin and this is simply a stupid way to lash out.