You told me about these related brokerages, I would say that it could be true.. I would also like to include there an old brokerage that broke bitflip and bitexbook, they are all Russian. Bitflip after suffering a hacker attack sold itself to bitexbook. I've already talked to bitflip's support about slow transfers in the past and I remember that they had the same way as mercatox. They can all be of the same coin. The guy who answered at bitflip is called dmitry.