This purse belongs to the Kucoin exchange. It receives all BOS coins that we ship to the stock exchange. I saw this purse for a long time. I, too, thought like you. I wrote here about it (like you). But other users gave me the answer that I now give you. And if you look at the transactions a little, you will see that this is so.
The fact that there are 74134231 BOS on the Kucoin exchange is not consoling. This means that 15% of all issued coins are on this exchange. In addition, there is a Whalex exchange, on which coins are also located. Thus, about 1/5 of all issued coins are on stock exchanges. This suggests that 1/5 of the coin holders wish to sell them (at a low or high price) - they do not want to leave coins for the long term or launch their own units. This again confirms the poor marketing policy of BosCoin.