I was setting more accounts again and I was in such a good flow that I thought to myself "What if creating too many accounts the same day could get the accounts banned once manually reviewed". Wouldn't this explain the mass bans which I haven't heard many answer unless maxing the limits or not using proxies. If you have 50 accounts in same niche and tumblr looks one of them and checks others created the same day in "their way" and sees a connection between them. Same themes, avatars, browsers, windows and links is what comes to my mind. What's your thoughts?