In addition to Niresh answer:

<style>
   ins.adsbygoogle[data-ad-status="unfilled"] {
      display: none !important;
   }
</style>

Since the <ins> in the snippet doesn't have data-ad-status="unfilled", you'll get "Unused CSS selector" warning and Svelte will purge the CSS automatically. We can prevent it by having a conditional element that uses the selector in question that will never render:

{#if false} <!-- prevent svelte from purging "Unused CSS selector" -->
   <ins class="adsbygoogle" data-ad-status="unfilled"></ins>
{/if}