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Anyone can buy a domain so it does not create legitimacy in any way, shape, or form. As others also stated ISP's change, domains get bought and sold, sites get bought and sold, some want secure access no matter where they are at in the world and on whatever computer they are at.
Hell others rather keep the hosting expense of email down, others may enjoy the perks of say what gmail offers aside from mail; like logging your chats into your mail or responding to an email with chat and so forth.
Others mentioned the spam filter and well honestly there are a crap load of other reasons.
Now if you want to manually approve accounts and want to show some legitimacy. Then require that they give you a URL that has the who is as public info, that matches what is on the account. True all that can be faked as well but it is just as likely as good as the no free email route and it at least proves that they have a porn site up right?
Since I have gotten gmail I have only signed up to 1 sponsor so far who demanded a non free email account. That was after I emailed them and asked WTF? They let me through. Yet I will not do it again as it serves no good purpose unlike my FREE EMAIL does.
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