Steemit is a scam and I was cheated

I saw The Shadow Brokers's tweet, found Steemit, and thought Steemit was good, so I started using it. But when I posted some articles, Steemit asked me to buy Steem, just two days after signing up for an account. I can't post any more articles / comments. I went to read Steem's blue paper and white paper, where there was no mathematics at all. On the contrary, it was full of sales promotion and strange things, such as "Proof of Brain (PoB)". In addition, when you sign up for Steemit, it will register you a TRON wallet, and TRON is the "masterpiece" of Sun Yuchen, a notorious Chinese cryptocurrency swindler. I have never been deceived, but this time I was cheated so badly that I couldn't help sighing.