Add modestbranding to WP Gutenberg Video Blocks

wp-hide-related-videos-sitewide.php

<?php

// Add modestbranding to WP Gutenberg Video Blocks
// https://wpforthewin.com/remove-related-videos-wp-gutenberg-embed-blocks/

function wpftw_modest_youtube_player( $block_content, $block ) {
  if( "core-embed/youtube" === $block['blockName'] ) {
    $block_content = str_replace( '?feature=oembed', '?feature=oembed&modestbranding=1&showinfo=0&rel=0', $block_content );
  }
  return $block_content;
}
add_filter( 'render_block', 'wpftw_modest_youtube_player', 10, 3);