Not even students. The modifications performed by spinners are frequently silly - they amount to taking some percentage of words, looking them up in a thesaurus, and replacing them with a randomly chosen synonym. It's pretty common that the synonym is inappropriate for the context, so the results are ridiculous. For instance, here's what a spinner does with this paragraph:

    Not even understudies. The alterations performed by spinners are oftentimes
    senseless - they measure to taking some rate of statements, turning them
    toward a thesaurus, and reinstating them with a haphazardly picked
    equivalent word. It's pretty regular that the equivalent word is unseemly
    for the connection, so the effects are ludicrous. Case in point, here's
    what a spinner does with this paragraph:

It's good enough for spammers, I suppose, but it's easy to spot. The overall sentence structure isn't changed, either, so that's still ripe for analysis.