Concerns:

• Supporting folks with poor bandwidth or limited traffic plans. Yes! This is still a thing.
  
• Performance is still a consideration. Larger media will incur additional latency, cost, bandwidth, etc.
  
• Not everyone would really want this per se, see above point.
  

I kind of like the approach @lyse@lyse.isobeef.org and @movq@www.uninformativ.de already take, which I’m sure they’ve developed their own “processes” for this. Perhaps we can do something similar, accept the original, still do some processing, show the smaller versions by default and let users decide to see the original?