Do you understand the scenario that I am describing where a user purchases STEEM from the BlockTrades.us exchange (with BTC or ETH), and uses their personal Binance memo to have their STEEM sent to their Binance account?

okay, I understand.
We need to review the first posting of @darthknight now.
(https://steemit.com/hive-174578/@darthknight/hello-steem)

It seems way ahead of the others in terms of usage, activity and even the technical aspect of it seems very advanced even though I am not a developer. Color me impressed!

He starts the story as if it were his first visit to Steemit.
However, the transaction of his Binance wallet has already begun in 2018.

Of course, he may not have been interested.
He looks like an excited investor.

Why did he get steem from @omega?
Why did he get steem from @alpha?
Why did he get steem from @clea?
Why did he get a steem from @Sashleigh?
Why did he get steem from @anastacia?

Do you think all of this is a deal that started at @blocktrades?

Let's first look at the record of @omega, the first transaction.
The account was a very fast investor with Steem account number 507. And he got steem through the pow. It received the powerdown of accounts @open-wallet and @openledger.

And among the transaction history, Binance output has only 101130147 memo.
It's very surprising. As you can see, blocktrades.us has a lot of deals.

Was @dartknight a very special person?

Did @blocktrades manage him specially? This is unknown, but when you look at the transaction history, he's connecting similarly to other auxiliary accounts at @blocktrades.

So, I think it's very close to blocktrades.us with him,
When I think of @keptorin, who he set up, my doubts become increasingly certain.

We don't really care if he's actually @blocktrades. It's just curiosity.