Somewhat, yes. I had a bunch of alts that used similar emails, they all got axed, but one was spared, perhaps because I never clicked to confirm the email. Then I suspect they linked any remaining or new accounts with different emails via a recent desktop browser.

It was kind of cool looking into when everything was banned. Accounts I hadn't logged into for years had been banned, all together - but not immediately with the first main ban.

I think IP alone isn't enough for them to decide to ban, though.