The first 'default' tentative failed:

  $ scp g13578.png <user>@ssh.couchdrop.io:
  Unable to negotiate with 54.66.180.100 port 22: no matching host key type found. 
  Their offer: ssh-dss

The second works with a small fix:

  $ scp -oHostKeyAlgorithms=+ssh-dss g13578.png <user>@ssh.couchdrop.io:
  Password authentication
  Password: xxx

but I don't understand why I'm logged as michael.lawson!?!