> Only I know the threat models I care about for any particular account I have.
You are not neccesarily the person being negatively effective.
Email service providers are all about reputation so their stuff isn't marked as spam. When your account gets hacked and starts sending viagra ads, you are not the one who suffers the fall out.
There are lots of email providers out there with different policies. One of the reasons gmail is popular is because of these policies.
Gmail is already a well-known spammer. Loads of spam come from Google, I see it everyday, by far the biggest source of spam I see. Unfortunately, they're also so big, with so many legitimate users, that you can't block them wholesale if you're expecting to deal with the public, many of whom have a gmail address.
You are not neccesarily the person being negatively effective.
Email service providers are all about reputation so their stuff isn't marked as spam. When your account gets hacked and starts sending viagra ads, you are not the one who suffers the fall out.
There are lots of email providers out there with different policies. One of the reasons gmail is popular is because of these policies.