<p>It reads to me as if AWS are now sponsoring our site. Perhaps we should contact them to find out the implications.</p>

<hr>

<p>After looking around a bit&mdash;no, no-one from SE bothered to tell any of us&mdash;I found a <a href="https://meta.stackexchange.com/questions/307861/site-sponsorships-bringing-resources-back-to-stack-exchange">post on Meta SE</a> about site sponsorships, which shorn of ballyhoo, says:&mdash;</p>

<blockquote>
  <p>A sponsorship generally entails enabling ads relevant to the subject
  and affixing a small "sponsored by..." logo in the upper-right corner</p>
</blockquote>

<p>We're assured that:&mdash;</p>

<blockquote>
  <p>[...] sponsors do not own these Q&amp;A sites. Sponsors work alongside our
  communities who ultimately build these sites. Communities ask the
  questions; communities create the tags; communities conduct elections
  as they do now, and we are not renaming our current sites like a
  garish sport stadium to the highest bidder. Any ads a sponsor submits
  still have go through our crazy-strict [sic] ad editorial process… as
  it has always been. Companies do not have access to personal data, and
  all Q&amp;A content remains irrevocably licensed under Creative Commons
  for sharing and attribution.</p>
</blockquote>

<p>To a casual visitor our site now looks like this:</p>

<p><a href="https://i.stack.imgur.com/NC3Rf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NC3Rf.png" alt="enter image description here"></a></p>

<p><a href="https://i.stack.imgur.com/pat0t.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pat0t.png" alt="enter image description here"></a></p>

<p>This represents a considerable advance over SE's home-grown efforts at uglification, though I've not yet come across any AWS adverts flashing or beeping at me.</p>
