A lot of sites freak out, either explicitly or subtly, when getting a connection from a known AWS pool. In a good case, you may get some explicit notification t

A lot of sites freak out, either explicitly or subtly, when getting a connection from a known AWS pool. In a good case, you may get some explicit notification that they don't like your IP and suspect you are a bot. In a bad case, the site would appear subtly broken (i.e. login won't work, or some functionality would refuse to load) and nothing would suggest it's the problem until you try a non-AWS address. Services that expect to be contacted by robots (which is mostly what runs on AWS) won't blacklist it, but sites that expect to talk to humans very much do so.