Blacklist Blocks

First you enqueue a blacklist.js (or whatever filename you want) like so:

add_action( 'enqueue_block_editor_assets', 'my_blacklist' );

function my_blacklist() {
	wp_enqueue_script('blacklist-blocks', get_template_directory_uri() . '/yourpath/blacklist.js', array( 'wp-blocks', 'wp-dom-ready', 'wp-edit-post' ), filemtime( get_template_directory() . '/yourpath/blacklist.js' ), true);
}

Then, on blacklist.js you put this (I put some core blocks as an example):

wp.domReady(function () {
	wp.blocks.unregisterBlockType('core/verse');
	wp.blocks.unregisterBlockType('core/columns');
	wp.blocks.unregisterBlockType('core/group');
}
);