E-mail clients are a terrible example. While relatively easy to install, they give you very little control, and no additional privacy.
To get all that, you need your own server. Ideally a home server, but many ISP forbid you to send e-mail at all (they close port 25). The next best thing is a remote virtual machine with root access. Either way, good luck installing Postfix and Dovecot. I have, and there's no way the "average user" could do the same.
>many ISP forbid you to send e-mail at all (they close port 25).
Can anyone name an ISP that forbids their customers from using SMTP to send mail?
My guess is that the person I'm quoting is confused by the longstanding spam-control measure in which the ISP requires the outgoing mail to go through a mail server designated by (and usually run by) the ISP rather than going directly to the recipient's mail server.
I'm not confused, and know exactly what you are talking about.
Call it pedantic, but yes, they do forbid you to send e-mails. Instead, they force you to ask them to send e-mail for you (that's how SMTP relays work). They're not completely forbidding you to use SMTP, but they do require that you go through their servers. That's quite the restricted SMTP usage.
The snail mail equivalent would be to forbid you to ship your mail yourself. Instead you have to give it to the official postal services so they can ship the mail.
Why would they do that? I see only one reason: they want to control your mail. They look at the destination, and maybe decide they won't ship the mail after all. They look at how much mail you send out, and maybe they won't send more than a dozen per day. They may open the mail (or otherwise X-ray it), and take "appropriate" action depending on the content, including not shipping it, building a customer profile of you and your recipients, writing your name on some black list, or archive the mail, just in case.
Spam mitigation? That's just a pretext they use to snoop over your private communications. (Or, more accurately, control their network. They will always push for more corporate control, that's what corporations do.)
Of course, you can bypass the limitation by using HTTP to ask another big corporation to send your mail. And receive and store your mail too. And deeply analyse it so they can show you customized banners. And give it to the authorities whenever they ask for it…
Such an Orwellian nightmare would never fly in the physical world. In the digital one however, they can capitalize on people's ignorance.
To get all that, you need your own server. Ideally a home server, but many ISP forbid you to send e-mail at all (they close port 25). The next best thing is a remote virtual machine with root access. Either way, good luck installing Postfix and Dovecot. I have, and there's no way the "average user" could do the same.
So, of course you don't use an e-mail client.