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Universiality, basically: almost everyone, everywhere has an email account, or can find one for free. As well as every OS and every device has a giant pile of mail clients for you to chose from.
And I mean, email is a simple tech stack and well understood and reliable: I host an internal mail server for notifications and updates and shit, and it’s rapid, fast, and works perfectly.
It’s only when you suddenly need to email someone OTHER than your local shit that it turns to complete shit.
For bandwidth intensive stuff I like wholesale internet’s stuff.
The hardware is very uh, old, but the network quality is great since they run an ix. And it’s unmetered too so it’s probably sufficient.