Never buy a twitter that doesn't come with the OG email. Only change the alt, I know that can save you for a ban. As for the Proxy thing, they will lock your account until you can prove you own it, and if you don't the ban will come and you won't be able to fix it.
I think you have a chance at getting banned if you are actively buying and selling twitters. But if you keep it lowkey you're probably good as I haven't lost anything other than @L9
I think you have a chance at getting banned if you are actively buying and selling twitters. But if you keep it lowkey you're probably good as I haven't lost anything other than @L9