Gutenberg change/remove “Write your story” placeholder in custom blocks

There does seem to be a filter to modify the default: https://github.com/WordPress/gutenberg/blob/master/lib/client-assets.php#L1574

'bodyPlaceholder'        => apply_filters( 'write_your_story', __( 'Write your story', 'gutenberg' ), $post ),

So you should be able to use the WordPress add_filter() function.

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