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Just feeling is not enough, I need to find some proof.

True, however, it is strange that a large stakeholder has not complained

I know you're right, however, we have a lot of data, maybe even steem witnesses can help us to clarify their presence. dapps are like ico for eth anyone can scam without problems. In fact eth has lost a lot for the erc20 tokens. Steem is doing the same with dapps, only that eth is huge as a market cap, steem if it continues like this it dies

I have just found that @powerguy with his accounts use this memo for binance: 103700729. But nobody else uses it. So powerguy has a separate Binance account, as it is not possible to create new memo here.