Email Marketing with non-opted emails

Hey, I would like to know some things on email marketing with scraped emails –

1) AWeber does NOT allow this but GetResponse and MailChimp do. Should I go with one of these or is there any other service you guys use for this?

2) Saw some people doing email marketing using Gmail (lol yeah haha) and Gmail banned their account which was obvious. So, my question is I will be doing either via GetResponse or MailChimp or such so what kind of ban or issue can I face?

3) These are highly niche…

Email Marketing with non-opted emails