[Zetaphor]

Cheaper sure, but definitely not better.

An automated system can't compare to an actual human, a human won't fail because the markup changed.

[bonestamp2]

It's not necessarily worse either -- if they're actively monitoring failures, updating their process and re-running the failed unsubscribes. It should be much easier to scale... especially if they move beyond using html forms and just hit the endpoints that the forms are hitting.